My reading habits are all over the place. For example:
Sci-fi: Asimov, Bradbury, Clarke, and other classics, plus modern sci-fi. And of course, all five books in the Hitchhiker's Guide to the Galaxy "trilogy." (If you like The Guide, you might also enjoy Adams' Dirk Gently novels.)
I don't read a lot of westerns, but I enjoyed the Lonesome Dove series.
Off-beat stuff: Kurt Vonnegut, Tom Robbins, Tony Vigorito.
I also read murder mysteries, courtroom dramas, and psychological thrillers, and flat-out comedies.
In non-fiction, I'm a science geek who also indulges in Eastern philosophy (mainly Taoism and Buddhism, not as religions but as a way of life.)
Others mentioned Dharma Bums (Kerouac) and Catch-22 (Heller). I liked both of those, although Catch-22 took a while to grab me. If you're reading it and thinking about giving up, give it a few more chapters - it'll be worth it.