Horror is my favorite genre of movies, and I buy more horror movies than any other type. I could watch them all day. I especially love zombie movies; they're my favorite type of monster. I do prefer scares and chills to blood and gore. I also like those campy-type horror movies.
I think my all time favorite horror movie is "Dawn of the Dead" (2004). I've probably seen it 200 times, and whenever it comes on Starz I still watch it. I think that "The Exorcist" is the scariest movie I've ever seen, and I still can't watch it alone. They say there's a subliminal demon face in several shots that are less than a second long, but I've never noticed them in the movie. I also like the first "Jeepers Creepers." The opening scene in the car with the old truck just coming out of nowhere...freaky. The unexpected ending...freaky.
Other horror movie favorites:
"Creepshow"
"Creepshow 2"
"The Shining" (the original version)
"Night of the Living Dead" (the Tony Todd remake)
"Wes Craven's New Nightmare"
"Land of the Dead"
"An American Werewolf in London"
I'm a fan of many other horror movies, of course, but these are the ones that readily come to mind.