Ok, first things first: The Ring wasnt as scary as the origional that first came out in Japan a year or so before. If you really want to get creeped out for a week, find that movie, its pretty good as scary movies go.
Event Horizon was one of the scariest sci-fi movies that I've seen so far. Definently look into it.
Now, the shining and the exrocist... these movies are kind of like silence of the lambs to me. I was told that they would be really creepy and all before i saw them and it dissillusioned me i think, so they didnt seem that creepy. Still, watch all three, they're classics and thats all there is to them.
Now, for my personal favorites:
Evil Dead - If you havent seen this, go rent this tonight. The sequels are funny, (Army of Darkness, haha) but the origional is really really awesome.
Halloween - Fucking crazy classic movie, make sure you have seen this before you turn 20.
Rosemary's Baby - This movie is one of those movies that is scary just because of how messed up it is. Check it out sometime, be prepared cause its weird.
There are a few more, i cant remember now tho...
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Rowen
'Aren't you Buzz Lightyear?'
*whispers* 'I love your movies!'
'URAAAAFWAAAGAAA!!!'