For me it's a tie between two favorites, both so-called "classic" authors: Jane Austen and Thomas Hardy. When I was in high school it was Stephen King.
King--his creative, original, id-piercing stories. Giant Bat/Rats. Aliens only smokers can see. A finger sprouting out a sink one night. What's not to love?
Austen--I guess somewhere inside of me is an 18th century English girl waiting to be free *snicker* or maybe I just love the language and the cleverness.
Hardy--because he's sensual, mysterious, and pessimistic. Like me *smirk*.