I don’t prefer Exorcist III over the original; however, I agree that the movie is excellent. The ceiling crawl is very creepy, and the scene where the nurse suddenly has a murderer right behind her never fails to make my heart race.
The difference between the movies for me is that I can watch III on my own; the original I just can’t.
Someone mentioned earlier and I’ll give a big second to Prince of Darkness. very creepy. A recent one I haven’t noticed mentioned is Resident Evil. I never played the video game, so I went into the movie with very low expectations and found it pretty scary and entertaining. I would put John Carpenter’s Ghosts of Mars in a similar category. Neither would make my top five list, but I found them worth watching. Oh, and in the sci-fi/horror class, Pitch Black is a great movie! Maybe not the scariest movie, but stylish, suspenseful, and smart.