I'm glad someone else likes Needful Things. It's the first King I read and has probably remained my favourite because of that (also because of how it revels in pure carnage and destruction).I agree with several others that The Stand may be his best. But I also found Needful Things to be worthwhile among his many other works. I actually found an antique shop on the Oregon coast with the same name and discovered the best "finds" there in comparison to any other such retail establishment I've ever visited.
For a King newbie I would recommend The Stand, It, Insomnia, Pet Sematary or The Shining as quite a few others have said.
Other King books that I liked, but probably wouldn't recommend to begin with, are Lisey's Story, Duma Key and Salem's Lot. If you do read Salem's Lot I reckon you'll get a lot more out of it if you've recently read or are closely acquainted with Dracula.