I've just recently finished:

Misery
1984
Lord of the Fly's
The Long Walk

Dragon Tattoo series was pretty good.

If you wanna stay with the classics, maybe: Great Expectations, Tom Sawyer, Moby Dick, Frankenstein

If you want similar modern books:
Firestarter by King was good that I read
The Martian Chronicles and Fahrenheit 451 are some modern classics like 1984
Jennifer Government is a very modern and polar opposite spinoff of 1984
The Brief Wondrous Life of Oscar Wao is gritty, award winning, and similarly themed to LotF

Slaughterhouse-Five - Kurt Vonnegut

Sword of Truth series by Tery goodkind ( assuming you are open minded and dont mind fantasy themed novels) its a great series, probably hands down the best books ive ever read, and ive read alot hehe

brave new world
any stephen king (recently finished the gunslinger series...incredible)
ender's game series

I agree.
About halfway through this book, and I'm liking it so far. Probably going to pick up some more Vonnegut when I'm done.

If you have never read any Heinlein then I would recommend one of his books, maybe stranger in a strange land, starship troopers or the Lazuras Long books. Also Enders game and the Foundation novels are good as well.

Homo Faber - Max Frisch