go with Nikon-Coolpix S550. it is better and has got lots more features and functions than nikon s510.

This 10 mega pixel digital camera comes with a CCD sensor, 5x optical zoom and 4x digital zoom. It has a 2.5-inch large LCD screen, a self-timer, inbuilt memory of 50MB and can be upgraded with SD Card. It also has features like Built-in-Flash, Auto Flash and Red Eye Reduction. The camera works on a Lithium Ion battery which can capture upto 200 shots in one battery recharge. Smile Mode, Blink Warning, Face Detection, In-Camera Red-Eye Fix, D-Lighting are the unique features of the camera.

MY OPINION U SHOULD BUY NIKON S 550 BCOZ IT HAS MORE MEGA PIXEL AND
THE MOST IMPORTANT THING IS THAT THE CAMERA WITH MORE OPTICAL ZOOM IS BEST.
AS OPTICAL ZOOM WILL FOCUS TO THE TARGET FOR PHOTO BUT DIGITAL ZOOM WILL ENLARGE YOUR PHOTO , BY THIS THE PHOTO QUALITY WILL GET WORST.
NIKON S510 HAS 3X OPTICAL ZOOM & NIKON S550 HAS 5X OPTICAL ZOOM.

SO BUY THE NIKON S550
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There are tons of Digital Cameras out there. If you want to shoot as a hobby i would go with the Canon Rebel series. I have a Canon Rebel XSi and it works wonders. O ya did i mention im a Canon guy..lol. Well if you just want a small point and shoot camera i would suggest the Canon SD1100 IS. this is the perfect camera for anyone that wants to take quick ready to shoot and print photos.
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Canon and Nikon have some best DSLRs.
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Buy Nikon D40 one of the cheapest DSLR on the market around $400 only.
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Run from Sony brand Cameras.
I will go for a Panasonic (TZ-5) or some Nikkon Camera.
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