Wait until after the SHOT Show. DD will have some more rails in the mix. I'm looking at getting a 12.0 Omega X without the FSB cutout once they are available. I like the profile of the rail at the receiver, (kind of like the KAC URX) and the QD cups.
Instructor: Handgun, Shotgun, Carbine, Sniper - Armorer: Colt AR-15/M-16, Glock x3