Also, chip, if you plan to buy 360 (the wise choice for gaming IMO) and you want to use wireless, I'd advise not buying the 360 wireless adapter. It is overpriced when you can get a wireless ethernet bridge for less that can be split to multiple devices where the 360 is plugged in.
i.e.
Newegg.com - SMC SMCWEBT-G 802.11g 108Mbps Wireless Ethernet Bridge - Wireless AP / Bridges
Does the same thing as the wireless adapter, then dump one of these on top of it:
Newegg.com - LINKSYS SD205 10/100Mbps High-speed Switch 5 x RJ45 - Switches
And now you have wireless access for 4 devices for less than the price of the single 360 wireless adapter!