What's the best horror movie?

Ok--I'll venture an opinion, if only because an unanswered question looks so sad.

I'm also going to avoid any discussions of subgenres of horror. There are so many, and there are excellent movies in each category.

Jaws. This is a movie I don't get tired of, even though certain things about it are dated. However, the acting is terrific, and while it is not gory by today's standards, it does provide a nice build up of suspense. Plus, it's given us some great quotes.

The Grudge 3 or SAW

silence of the lambs or saw

A Nightmare On Elm Street