You guys don't understand. He will spend around $300 on the 360. Maybe another $100 for the wireless adapter and then $60 on each game. Over a short bit of time, that will add up to quite an amount. Shouldn't he just buy the computer parts a bit at a time? There are thousands of free games he can play on the internet. Everything from shooting to MMORPG's. In the end, it will be cheaper to get a PC. $500 will last him at least a good year or so. By that time he will have easily spent that amount getting games for the 360.
Or he can mod it for free or $40 if he don't know how. And who really uses a wireless adapter anyways. Then just rent and burn =)