http://www.about-guitar-amps.com/used_guitar_amps.html has a few pointers on buying used amps, the whole website is pretty informative, not much else that I can find, but if I do will edit this answer or answer again with more info.
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First of all, do your research. Look up some information online before you go to check out the amp, so you know what to look for when you're there. Look at online reviews of the amp, as these will tell you if there are any recurring problems with the amps, as they age.
Also find out the basic details like solid state or tube, watts, etc. as these will help you decide what amp is best for you.
If your buying a tube amp, ask how recently the tubes have been changed. Check the current tubes and the sockets for any damage whatsoever.
Like you said, definitely bring your own guitar to play on the amp, so you know what it will sound like when your playing at your own home, with your own equipment.
Don't be afraid to turn up the amp either. Alot of tube amps have different tones at higher volumes, so work through the range and make sure you like all the tones.
Other than that, just be diligent in inspecting the amp, try and haggle the seller down, and make sure your getting the best deal possible.
Hope this helps!
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Buying Used Guitar Tips

Buying a Fender Guitar

Are you considering buying a used guitar? If, so, then know what you are buying. Used guitars are generally classed into four categories. They are as follows: old used, new used, refurbished and needs work.

Buying a used guitar can be a good investment, as they tend to come in at about half the cost of buying a new guitar. Most used guitars age very well and they often sound better too.

These are the used guitar categories: 'Old used' guitars are generally ten years or older. The 'new used' category usually offers guitars that are less than five years old. 'Refurbished' guitars fall into the category between the old used and new used age group but because they have been overhauled they are generally more like new used. The 'needs work' speaks for itself and you should keep away from these unless you really know what you are looking for.

But before purchase your used guitar, take into consideration the following points:
Wood ages better than plastic. The neck joint should be flush to the body of the guitar, and the space in front and behind the bridge should be flat. Make sure the neck isn’t twisted or bent.
You may have to clean it up and change the strings, are you sure this is something you want to take on? Remember, if the guitar looks good, then it will probably sound good.

Make sure you do plenty of research before you make your decision. Don't rush into buying the first used guitar you see just because its 'on sale', the 'last one', etc. There are usually plenty of used guitars for sale at very reasonable prices. Factory Seconds can offer great deals on recent models. You can also find some great deals on websites like Ebay. Look for sellers who have sold guitars before and have positive feedbacks. There are also some good bargains to be had from your local pawnshop. You could also do a “google” search on the Internet to find a used guitar, whether you are looking for your first ever guitar or a new top of the range guitar, if you have a favourite brand of guitar this will open up lots of opportunities for you. You can also find some very expensive, rare, antique used guitars up for sale.

If you would like more information on new and used guitars and accessories please visit my website at:

www.newandusedguitars.com

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Suzie Smith is an author who enjoys researching topics of interest to her and sharing them with othershttp://www.newandusedguitars.com

sources:

http://www.usedbass.net/buying-used-guitar-tips

What to look for

Guitar Amps

Now that you've selected your dream guitar, we need to find an amp to go with it. There are numerous options depending on size, sound, amplifier technology, and configuration. Below, you find a friendly guide to steer you through the maze.

Types Of Amplifiers
There are four types of guitar amplifiers: Solid-state (analog), Tube, Modeling (digital), and Hybrids.

Solid-state Amps: These amps are called solid-state because they use transistors for their preamp and power sections instead of tubes. They are very reliable and seldom need repairs. They often have a very clean tone, although many come with "distortion" channels also. These amps are popular with players looking for a sturdy, reliable touring amp.

Tube Amps: Tube amps preferred by many guitarists for their warm, fat tone and "organic" distortion. Tube amps usually sound louder than solid-state amps of the same wattage and have a definite "feel" that you don't get from solid-state amps. Most tube amps have separate channels that can switch from clean to distorted tones instantly. Tube performance can deteriorate over time, so tubes need changing occasionally.

Modeling Amps (Digital Amps): Modeling amps use digital processors to simulate the sound of old-fashioned tube technology. Using software that "models" the sound of tube amplifiers (and cabinets), these amps put the sound of numerous amps in one box. Modeling amps are programmable, and often have built-in digital effects such as delay, chorus, etc. Some include digital or analog outputs with speaker simulation for going direct into a recording interface or PA system.

Hybrid Amps: Combining the best of each type of amp into one package, these amps use an actual tube in conjunction with the solid state power section of their amps. Marshall Valvestate amps use tubes in the preamp section and solid state circuitry in the power section to create a tube tone without requiring the use of power tubes.

Configurations
In addition to types of amplification, amps come in different configurations. Combos (short for combinations) are self-contained units containing the amplifier and speaker in one cabinet. Amps also come in separate Head and Speaker Cabinets. These allow you to use any amp head with virtually any speaker cabinet. They also break the amp into two units, making each unit lighter and easier to carry than a single combo. Combining two cabinets and a head is called a "stack."

Construction
The thickness of wood used to construct the cabinet is a major factor in determining the quality of sound. The thinner the wood used, the more likely the speaker will vibrate itself loose. A thickness of at least 1/2'' will achieve a strong sound and keep the speaker in place. Another factor determining sound quality is whether the amp has an open or closed back. Closed- back guitar amps produce a better bass response from the speaker.

When moving an amp from gig to gig, it's quite common for them to get banged up a bit. Good corner protectors will add to the life of the guitar amp.

Power and Speaker Size
The power rating and size of speaker you choose for your amp will depend to some degree on application and price. Practice amps are usually solid state or modeling combo units featuring low power (10-30 watts) and small (8" or 10") speakers, although there are some small tube amps to be found. For rehearsal and playing smaller venues, consider tube and modeling combo amps with power ratings averaging about 50 watts and 12" speakers for fuller sound. For larger venues or for performing loud, expect power to average at 100 watts and up. You can use "twins," or combo amps that have pairs of 12" speakers, but this is where a separate head and speaker cabinets (a "stack") are most effective.

Other Options
Other additional features you might encounter include:

Reverb Units: Some amps use spring reverbs, which can be very natural sounding, while others use digital reverb.

Effects Loops: These jacks allow you to add stomp boxes or rack units after the preamp section of the amp to avoid amplifying any effect noise.

Channel Switching: These amps allow you to switch between different preamp channels usually going from a clean tone to a distorted one. Check to see if a footswitch is included. Digital amps often require the purchase of an additional MIDI footswitch to change tones remotely.

Built-in Effects: Roland Jazz Chorus amps are famous for their built-in stereo chorus. Tremolo is another effect many amps feature (great for surf guitar.) Modeling amps usually contain multiple built-in digital effects.
Source(s):
http://www.sweetwater.com/shop/guitars/guitar-amps/buying-guide.php

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Silly question, but what style/genres are you planning to play?
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