Don't think im gonna get the orange box any time soon, got more than enough entertainment/ coursework to keep me busy. Even if i were to buy it, it would DEFINATELY be on the pc, i wouldn't even contemplate the 360 carp. Any half-life game is made to be played on a mouse + keyboard.

With regards to the xbox headset, i would DEFINATELY recommend getting a sennheiser and a seperate mic around your neck, thats what most people on the mlg forums recommend. Plus you could continue to use the headset for your pc also. This way, you wouldnt disturb anyone whilst playing in the middle of the night. The sound quality from the sennheisers is supposed to be amazing

Which are the headphones these guys are using???

http://www.halo3forum.com/halo-3-mlg-competitive-gaming-discussion/164857-best-gaming-headphones-2.html
Almost certain they are the hd 555s