Normally, I would of voted for the Mesa Urbino but I don't trust the way they attach the recoil pad to the stock. A LE friend of mine had one of the tabs break that attaches the recoil pad during shooting drills. That is the only weakness I see with the design.
I'm not a fan of the Blackhawk either.
I would personally go with with the Hogue, Speedfeed, or Mesa Tactical AR adapter stock. I only got to shoulder the Magpul stock and it feels nice but haven't had a chance to run it yet but I have heard really good reviews so that might be another option.