Well, i struggled with this, found footage generally sucks in my opinion.
So here's all i could come up with, the first eight i like, the last two are added purely to make the ten.
Cannibal Holocaust
Man Bites Dog
The Blair Witch Project
Rec
Rec 2
Cloverfield
Diary Of The Dead
Ghostwatch
Last Horror Movie
Paranormal Activity
I actually thought some parts of p activity were good but disliked the ending.
Ghostwatch i've included because of the footage element although i don't think it ever gets lost at any point, i know it's t.v but it's feature length.
I normally wouldn't include two films from the same series in a ten, but i really liked Rec 1 & 2, so sod it.
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MIKE: I've got it! Peter Cushing! We've got to drive a stake through his heart!
VYVYAN: Great! I'll get the car!
NEIL: I'll get a cushion.