I very solidly recommend Behind The Mask: The Rise Of Leslie Vernon. the first 2/3rds of the move is a mocumentary about a film crew following a new Town Killer (in the vein of Fred Kruger, Jay Vorhees and Mike Myers). It's hilarious and charming. Then, it pulls out of the Mocumentary style into a mediocre slasher, but its a wonderful ending to the way the rest of the film is pulled off. I bought it on a whim (at Suncoast, based upon a recommendation from a friend) and i don't regret it. I've watched it a few times, but it's more of a once and done film, but pass it along to friends, because i think any fan of horror should see it once.
Hope that helps on one movie