Modern Fiction:
I saw
Infinte Jest mentioned, but all the titles by the author David Foster Wallace are amazing. Some are even less than 500 pages!
also,
A Heartbreaking Work of Staggering Genius by Dave Eggers
Classics:
I'm in love with
Stranger in a Strange Land by Camus
Nausea by Jean-Paul Sarte
The Sound and The Fury by William Faulkner
The Canterbury Tales by Geoffery Chaucer
all I can think of that haven't been mentioned