Stephen King is my husband's favorite author, so he always gives me books to read, lol. So far my favorite of his is probably The Long Walk. I actually read it back in high school (before my husband) and got really into it. I thought it was interesting to watch what they all went through and then the ending really makes you wonder what the heck happened.
I'm in the process of reading the Dark Tower series right now, I'm on the third book (I believe). They're good thus far. I refuse to read IT though (fear of clowns + reading a book about an alien-clown thing = not happening).