Philip Dick, Aldous Huxley, Frank Miller, George Orwell, Ray Bradbury, Steven King, Piers Anthony(loved Firefly), Dean Koontz(Hiedaway and Dragon Tears), John Saul, Anne Rice, Anthony Burgess, A.E. Van Vogt(World of Null-A), Robert Heinlen, Sir Arthur Conan Doyle, Poe, Lewis Carrol, C.S. Lewis(The Screwtape Letters), H.P. Lovecraft(anthing to do with Cthulu), Dasheil Hammet, Mickey Splliane, Raymond Chandler.
I like conspiracy theorists too, they are just so passionaltely commited to exposing their various boogymen that I simply cannot resist reading.
If its dark or not afraid to look into the darkness of the human soul, has Sci-Fi elements or mystical elements I will probably be moved by it. I'm absolutely nuts about endings with a twist!