Steve - have read all but 2 (didn't know Rosemary's Baby was based on a book!). Must have been hard to limited yourself to 2 by Stephen King (the master). But i don't classify Kevin as horror (but LOVED it). Physcho-thriller?
I was debating about Kevin. I've seen it most often as thriller. But the fact it gave me nightmares and the wotst monsters are people... I didn't think it was a stretch.