Wrong Turn 1 and 2 were both great. I quit watching part 3 about 20 minutes into it because it was a little over the top. The best movies are the everyday "this could happen to me" type movies. (Scream is another example)
The interesting bits of the exorcist i find scary. But also i watched part of a film called To Let one night, its a foreign film and the sort of film that you find yourself feeling the fear for the characters, even though its a film, you cant help get drawn in by it. I intend to watch it all some time.