Originally Posted By Market_Garden:
Of the choices you mentioned, I'd take the Omega hands down over the CASV, if for no other reason than it's 5.5 ounces lighter. The Omega has an excellent reputation as well.
My favorite handguard though is the JP/VTAC Modular piece. It doesn't look tacticool but it's solid, light, comfortable, and gives you tons of options for mounting stuff.
I have the Troy Extreme 13" and I love it. My hands aren't huge and I can get an excellent grip on them. Plus without the rails it is only 11.5 ounces. The long sight radius is nice too.