Ask HN: Understanding Wireless Networking

Quick question here. I'm setting up my home server and network in preparation of adding a Boxee Box to my home theater system. I have been using an Xbox 360 previously and the wireless streaming over a Linksys WRT310N is pretty abysmal (buffering every few minutes). I'm not quite sure if this problem is more the fault of the Xbox or wireless network.

I would like to set up the network to allow internet usage while preserving the ability to stream high bitrate content wirelessly (think 1080i and 1080p). I have contemplating using a separate router specifically for the media streaming -- perhaps on 5.4Ghz band with the normal usage on 2.4.

What are you thoughts or recommendations on this subject? Thank you!