i'll just have to try it
I did some searching and didn't see anyone talking about that particular setup. I have a large KM frame with an S2 headset on it awaiting buildup. I spec'd out the rest of the parts i'd want on it, and that came close to $1000. But, as many other's have already pointed out, at $999, the GF Rig retails at less than the sum of its parts. So I went out and bought a Rig and it's being built up this week. I'm going to tell them to put the S2 headset on it because I heard the stock one is garbage, and I was also thinking it would make it easy to try the Rig rigid and the KM suspended. If the S2/RebaSL/KM setup doesn't quite work, and I decide I really want suspension on the monkey, I will try a different headset. Thanks for the advice.