Stephen King is an inspiration to me. My short story,"See You In the Bahamas" is my ode to him. I owe much to him as a writer. So with that said, I cannot decide on which of his novels are the cream of the crop. However, I can recommend a few, like seven for instance:
The Dead Zone
I challenge anyone to read any of the seven listed here if they never read him before as they will most likely become fans of his if they do. "Different Seasons" was my favorite of all of his novella collections, as it contained "Rita Hayworth and the Shawshank Redemption," "The Body," "The Apt Pupil," and "The Breathing Method." Although the first three were made into excellent movies, "The Breathing Method" won't ever become a movie (I think you'll agree If you've read it).
I thought the "Green Mile" was great as a serial novel and was much better than the movie. It was torture for me having to wait for a new serial every 30 days!
In addition, his instructional book,"On Writing" is a must read for anyone who is pursuing the craft of writing. It rivals Strunk and White's,"The Elements of Style" which is arguably the best book on writing in which all others are compared. "On Writing" was actually on my syllabus as a reading requirement for a novel writing course I took in college.