I love horror and nothing usually scares me...so when a movie does scare me, its good!
The Descent is my favourite horror....I actually had to turn the lights on half way through the movie cos I couldn't watch it in the dark anymore! Real good quality.
If you want something a bit more "entertaining" and less "horror" watch Cloverfield, which I really enjoyed this year. Not many jumps or shocks, but a quality bit of film-making.
The best horror these days is all Asian, so the originals of The Eye or Dark Water are MUCH better than the American copies.
Enjoy and don't get too scared