I read this book, and I absolutely loved it. As a rabid King fan, my opinion is a bit biased, but undoubtedly any author who has ever picked up one his novels must agree that his method of characterization is awe-inspiring. Under the Dome has a complete melange of strange and fascinating individuals with a wide range of flaws that serves to humanize them. Although I personally felt the ending of the book was abrupt and jarring—mainly because it lacked any build up toward such a supernatural direction rendering the end gratuitous at best—as a whole I share your sentiment that Under the Dome was a sensational read.
For farther reading I would highly suggest, Salem's Lot(One of his early novels, it is both a smaller and more rewarding read), The Shining(The narrative is a bit verbose, but if you bare with the book, the plot more than pays off with excellent suspense that bleeds into pure, classic horror), and Just After Sunset(A collection of short stories that contains the fantastic tale of patient N, and shines a whole new and disturbing light on obsessive compulsive disorder).
For farther reading I would highly suggest, Salem's Lot(One of his early novels, it is both a smaller and more rewarding read), The Shining(The narrative is a bit verbose, but if you bare with the book, the plot more than pays off with excellent suspense that bleeds into pure, classic horror), and Just After Sunset(A collection of short stories that contains the fantastic tale of patient N, and shines a whole new and disturbing light on obsessive compulsive disorder).
xx. bon vivant