We've been on a horror flick spree lately and I have 3 from redbox:
Let Me In - thought I was going to despise, but actually enjoyed it. Not a classic, but good way to fill a rainy afternoon.
Case 39 - if you can get beyond Renee Zelwigger's weird squinty eye thing, this one had a little suspense thing going on. Not bad.
Last Exorcism - cool concept, ending left mr COMPLETELY flat, DO NOT waste the dollar. Unlike The Exorcist, this one wasn't even disturbing at any level. The Exorcist BTW, one of the scariest movies to this day IMO.