The flick that freaked me out at the movies as a kid was Burnt Offerings. Also the scene in Salem's Lot where the vampire with glowing eyes floats up to the window and is trying to get in. I agree with your thoughts on The Exorcist. That and Halloween are my top 2 of all time. Would really have to think to come up with a top 10 list. I've seen so many. The Shining would probably make it just for atmosphere.