[Jeebus]

If you like palahniuk, try lullaby and invisible monsters if you haven't read them (in that order). I really like East of Eden by John Steinbeck and am in the middle of Winter of Our Discontent and it is real good so far. The Ender's Game series and the Alvin Maker series by Orson Scott Card are also real nice quick reads when you just want to be entertained. I think everyone knows about Ender's Game, Alvin Maker is about the U.S. when it was still colonial. All of the folklore is actually true and there is different history of events. It is actualy really good.
If you can deal with the length, I definatly recommend War and Peace.
If you like Philosophy try Zeno and the Tortoise. It is a collection of summaries, opinoin, and other stuff on some of the best philosophers in history.