I would say either
Annabelle
Insidious Chapter 3 or
The Texas Chainsaw Massacre (2003)
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REC Horror movies generally bore me senseless. But REC didn't pull all the crap that usually happens in Hollywood horrors. It is more of a thriller than a horror, though. Still, the best of the genre I've seen. Grave Encounters and the first Paranormal Activity are also good films.