Misery is probably my favourite King novel. Although people ask me about the more violent sections, it's the psychological terror that gts me in Misery, especially when the main character finally gets to exploring the house while Annie is away. I actually enjoyed the ending too, which is sometimes a rarity for me.
I've also read The Shining, Carrie and It. The Shining is good, though it might not provide thrills anymore. A lot of the time, you can see everything coming, though some bits are pretty eye-opening, particularly the bath lady. Carrie is good for a shorter read, and a different approach. A lot of it is told in the past tense, through fictional newspapers, and so you learn different parts of the story as you move along.
The only problem with It is it's sometimes excessive length. Otherwise, I thought it was a great horror story. It's driven by character development, which happens to be excellent. I should buy another of King's at some point. I want to buy Rage, but it's harder to buy nowadays due to Columbine and other shootings in schools.