Everyone differs as to what makes them scared. I found this article which helped me find some new ones based on my own preferences.
How to Choose a Good Scary Film
If you really want to be scared, there's a lot of great and gory Italian horror films by Lucio Fulci. Also you can't go wrong with the original EVIL DEAD. And a lot of Asian horror films like A TALE OF TWO SISTERS from Korea are really creepy.
