Neipas02, the flickering of games showing is actually, the games fault. I seems that bungie didn't design it too well to see more than one system link game at a time. Xlink has the same problem, but they have already looked into it and found that as the cause.
I haven't used xbc, but if you can manage 16 players, one including myself (any maybe my bro on another xbox), then I am up for it. I like big games. Unfortunately, the host will need a t1, since most dsl or cable connections can't take more than 6 people.