I'm a RRS user, too, and couldnt work without it.
Just bought a Benro C-158 carbon tripod and a Markins Q3 Emille head. About 3 lbs (1.5 kg) and the head is RRS compatible. So far, as well build as the Carbon Manfrotto and Arca head.
I have the FlashPoint Gitzo knock-off 1128? that's like a Mountaineer and the Benro is a better build and more rigid, though a few ounces heavier (not much!)
The FlashPoint was adequate for a commercial shoot in Europe and size, weight, price were factors. At full leg height, it's not as rigid as my others but with care and cable release, did the job using a D300 with battery pack and PC lens. I almost wish I had the next size larger, thus I bought the Benro.
The M9 is a bit lighter and smaller than my system and either may do the job for you.