The Gods Themselves -
Because of the middle section, which was both absolutely brilliant and included
non-humans and sex (Asimov had often been accused of being unable to write
stories with non-humans or sex and therefore leaving them out of his
work.)
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I'm a huge fan of the entire Foundation series, particularly the first couple of books.
You can either read the books in the order they were published (as I did), or in chronological order.
I read "Foundation" first, and was pretty happy with it.
http://upload.wikimedia.org/wikipedia/en/2/25/Foundation_gnome.jpg

Here's a link to the full list of Foundation novels, which is pretty extensive: http://en.wikipedia.org/wiki/Foundation_series#List_of_books_within_the_Foundation_Universe

And the Wikipedia article for background info: http://en.wikipedia.org/wiki/Foundation_series

I highly recommend it!
Source(s):
Reading the books, and Wikipedia for background info: http://en.wikipedia.org/wiki/Foundation_series

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