There's this one that just came out that's called Super 8. It's not REALLY scary but it is a bit chilling. If you want to go for things not in the theaters there are some old ones that are good. Even Alfred Hitchcock is chilling. I don't watch many scary movies either because they seem to be all rated R so I only know a few. :) I hope you find something you like!
There are several movies you can choose from including: 13 Assassins, Red Riding Hood and 1408. Other good movies under this category are: The Last Exorcism, Abandon and Carriers. You can also get more from this link http://www.moviefone.com/dvd/horror/pg-13