You will get a lot of good different ideas and suggestions on here but it would help if you say what your budget is and how technically able you are for setting things up. Also, are the lads using their xbox's on a wifi connection ? If so I would first take the load off that by getting them an ethernet connection - preferably direct (via a switch I guess) or by powerline adapters
-------------------- Services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.