Best horror movies?

What are some of the best pg-13 horror movie ever...for a slumber party?
Either supernatural, slasher, or just plain old scary.
Thnx<3

the best horror movies I would love to see at a party would be

grudge 1 and 2
ring
the messangers
saw (how many sequals)
chainsaw massacre
ghost ship (is a good one not really all that scary though)

hope you find a good one(S)

I've got 1 good 1

the decent

Uhm. Amityville Horror & Amityville Horror Dollhouse.
hmmm...The Hill have eyes 1&2.
(:
I love scary movies : D

The Hills Have Eyes 2

hmmm pg-13? thats a toughie... not many horror movies with that rating...
try something by m. night shamalan (the dude who made signs). I doubt his movies are rated are and they are scary enough