Can't limit to 5, and I don't think I can put them in any order, but:
Halloween 1~3
The Thing
Christine
The Fog
(basically there was a run where John Carpenter could be considered as good as any director at that time)
Others I enjoy:
It (the original TV mini-series, not the movies, which were okay)
Halloween 6: Producer's Cut
Night of the Living Dead
Friday the 13th 1~7 (I have soft spots for Part 5 and 7)
Ghost Story
Pet Cemetary
The Amityville Horror (scariness was predicated on it being real, which later turned out to be fake)
Sleepaway Camp 1 & 2 (I admit I like 3 too, altho most hated it)
Blair Witch Project (not so much because it was that scary, but mostly because of documentary stuff at the beginning and the backstory mockumentaries on Sy Fy)
Scream (the original)