If you're feeling a little masochistic, The Sound and the Fury by William Faulkner is always a good choice.
If you're looking for something enjoyable and simple but relatively acclaimed, I recommend Revolutionary Road by Richard Yates. There's a Leonardo DiCaprio and Kate Winslet movie coming out based on the book. Other books I recommend - Atonement by Ian McEwan and Lolita by Vladmir Nabokov.
The Catcher in the Rye might not be AP Lit reading standards, but it's my favourite book of all time so do give it a read if you haven't.
