Ok here goes. I have to say that there arent horrors that really scare you, but in some of them the story is really good. So my list may include those kinda films.
Jeepers Creepers 1 & 2 <--- Good but kinda old
Ring 1 & 2 <----- Good (ring 1 is really good and different)
Silent Hill < ------ A very good one, I played silent hill game first and It was the best horror game I have played. the film is also good.
The others <------ Really Good story
Messengers <---- OK
Grudge <------ OK
The Thing <----------- This is kinda old(1982) but scary. Can give a good rating scary wise.
Alliens <-------- Old, scientific and good.
Wolf Creek <----- Good
Omen 1,2 &3 <--------- Kinda old but good.
Cabin Fever <-------- OK