I for one love Arachnophobia, more creepy than scary, and chicks really get freaked out by that movie, so you are more likely to get some pussy after seeing it.
Lets see some scary movies I love:
Nightmare on Elm Street series (huge freddy buff)
Halloween ( I say the first 2, the rest suck, and don't even mention 3)
Hellraiser (again first 2)
Child's Play (minus 3)
Original TCM
Remake TCM (yes I liked it so fuck off)
Dead Alive
Poltergeist
Exorcist (only the first one)
Carrie
Silence of the lambs (yes its still horror to me)
The Thing
The Dead movies (Romero zombie trilogy, want to see the remake)
Misery (not exactly scary but the hammer scene always gets to me)
Alien & Aliens (3 was cool, resurrection blew)
Seven
Sleepy Hollow (Tim Burton version)