If I had it to do over again - I wouldn't have any of my Colts. In fact, I had to send a Colt 6920 lower back to the factory on Thursday (the disconnector wasn't allowing the hammer to properly set - or - the safety to engage).
BCM isn't going to have the "tight fit" of a Rock River or the "upper and lower color match" of a S&W. However, its going to more durable and therefore more reliable.
BCM is now the only brand I recommend (have been having some issues a few of my Colts).
As a related side - buy some Slip2000 EWL. Its AMAZING stuff. I keep a 4oz bottle in my chest rig.