Summer book suggestions for an avid reader?

So, lately I've been working through the top 100 american classics list. I could keep with this, but I'd like to hear what your favorites are. I try not to read whatever is best selling at the time, (I just now got around to reading the DaVinci Code [hated it] and the first Harry Potter, [two thumbs up]) So... show more So, lately I've been working through the top 100 american classics list. I could keep with this, but I'd like to hear what your favorites are. I try not to read whatever is best selling at the time, (I just now got around to reading the DaVinci Code [hated it] and the first Harry Potter, [two thumbs up]) So no twilights, no chicklit, and no Nicholas Sparks. Aside from that, I'm open to anything. What is the best book you've ever read? What is something I would not be complete without reading? Here is my Summer reading list so far:

Gone With the Wind
The Hitchhiker's Guide to the Galaxy
Tender is the Night
?

....thanks!
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