Lord Of The FLies is good with it's suggestive nature of religion. Ernest Hemingway has some great books, like Old Man and The Sea, A Farewell to Arms and For Whom The Bell Tolls...

And if ya want a psychological rollercoaster, check out Fyodor Dostoevsky, books like Crime and Punishment, Memoirs From The House Of The Dead, i think it was said he was genuinely insane, but anyway...
Gabrial Garcia Marquez, Love In The Time Of Cholera, I didn't like Crucible too much as a play or written as a scripted play, but it's allegory, Animal Farm is definitiely a good representation of communism, totalitarianism and the vices of modern politics...

The Watchers by Dean Koontz, a bit trashy but quite well written, in it's own way...

A Clockwork Orange, now that's fucked, but brilliant, better to read than watch i think, I read some Charlotte Bronte, and Sense and Sensibility but it isn't great, a bit too "English", cliched...

The Lord Of The Rings books are much better than the films, A Picture Of Dorian Gray, the unabridged is real nice in it's descriptive manner, and has an interesting moral...

But I must say I did enjoy the Harry Potter books simply because they were so imaginitive, a different world within your own...

Catch 22 is funny as hell, definitely tragic comedy, but it appeals to human nature, The Prince by Niccolo Machiavelli, more of a political guide then a novel but it outlines western politics very well, though it's based more on princedoms then republics, you have to make the nessecary alterations in your mind...

They're my favorite reads, a bit much but hey!