I'd also recommend his short-story collections, especially Night Shift and Skeleton Crew. The story "The Boogeyman" gave me the screaming heebie-jeebies and "The Mist" still makes me more than a little nervous on foggy days.

As far as novels, I recommend Carrie and Eyes of the Dragon, which was a fantasy novel he wrote for his daughter (iirc). These are also shorter works and when King is writing shorter pieces, he seems to have better focus on the story than he does in some of his longer works (though, that said, the expanded version of The Stand really did add something to the story).

I'm also pretty fond of Christine and Talisman