Don't bother with Sinister. It's pretty bad.
For my horror movies I've recently watched John Carpenter's the Thing and Exorcism of Emily Rose. The Thing is still one of the best horror movies ever made with one of the most original alien's ever presented in a movie. Exorcism of Emily Rose is a very under rated possession movie. Great atmosphere and mood. Very solid acting and the scene in the barn was great.
That is not dead which can eternal lie and withs strange aeons even death may die.