Can anyone name me a GREAT horror movie?

I’ve seen quite a bit of horror/suspense/thriller genre. When I get to video store, I find myself becoming skeptical about the quality of scary films out there. I’ve always prefered recomendations over advertising. Sometimes, I get lucky and see something worth a second look when I choose on my own. I really like films that are older, more random, cultish, foreign. Suspense and thillers are wonderful, as well. Ones that make you use your mind a bit. I’m okay with gross and gory. The plot is key, though. I need a good story. The moer obscure, the better. I’ve most mainstream, but I’d love to hear your suggestions. Find me a good one!