I just installed a Geissele SSA-E in an AR-10, it's a really nice trigger. If it's in your budget, it would be the first one I recommend.
For the money, I would get a rock river over the CMC. IMO the CMC is not worth $50-80 more than the RRA.
If you can wait for them to build one, I've heard the LaRue MBT triggers are very good as well.