I have to agree. The best horror film I've seen in a long, long time.
It seems like most of the good ones have been mentioned.
Personal favorites I'd like to add:
An American Werewolf in London, Blair Witch Project (yes, I know, I'm probably the only person on here that likes it ), Invasion Of The Body Snatchers, Theater Of Blood (more comedy than horror), The Thing, Final Destination (trilogy), It's Alive (those kiRAB are scary), Salem's Lot and if I'm in the mood for a bit of cheese I like the occasional 'video nasty' like The Burning, Friday 13th, Driller Killer.