Ya, my vote would probably go for The Exorcist as well.

If you remember a few years back, they rereleased it into theatres. I was still young at the time, and had to have my friend's mom buy our tickets so we could see it, and we were definitely horrified by that movie.

Blair Witch was very original, and is in a category all by itself when it comes to horror/scary flicks. Some of the movies today like your Saw's and others, I think are in more of a thriller/suspense/drama genre rather than horror itself. They are not scary, just rather disturbing and bloody. Also, I'm sorry, but I definitely would not label Jaws and Aliens as "horror" movies...very good movies...but not horror movies IMO.