[power to the J]

Pet Semetary. I haven't read any other books you mentioned, but I still think PS is the best choice. I read 'Salem's Lot and it was the scariest thing I'd ever read, then The Shining took that spot, and then I read PS and that beat it. I suggest reading this when you have a long time before you go to sleep because you aren't going to sleep anytime soon after reading this.