Fright Night is vampires, gosh. Silver Bullet is a pretty good oldie, too, as far as more classical horror goes.
The Descent is a surprisingly good film. The subplots of what might have otherwise been a perfectly boring cave creature movie (a la the cave, how dare you) were actually sort of subtle. That movie made me feel emotions and shit - anger, hope, shock.
Someone mentioned High Tension, too. That was decent. Far down the queue, though.