Best Halloween movies?

Ok, i love scary movies, but i'm having trouble deciding what i should watch for a Halloween movie marathon. I typically don't like movies along the lines of Saw and The HIlls Have Eyes, or anything gory like that...i don't go for blood and guts, i just want something that will scary the s*** out of me...i have seen almost every movie in the horror section at Blockbuster, and can't come up with any that fit the bill of truly terrifying...any suggestions? I am asking for only the best and scariest movies you have ever seen, the kind that keep you looking over your shoulder for a week =D Thanks for all your help!! BTW, i have no preference as far as year of production....old or new, doesn't matter...as long as it scares my pants off!