Let the hive mind of Engadget get that for you.
"As someone who doesn't reside in the USA, I was wondering what would be the best way to get internet for my computer in the US for a couple of weeks? If it were Europe I know I'd look for some prepaid data. Is there anything similar offered by American carriers? A MiFi or a data SIM that I can tether from would work, but I'm trying to maintain a tight budget. Help!"
Not a bad package at all! For $600 you will have an HD-DVD player, an Xbox 360, and a Media Center Extender that can play ATSC HDTV from your MCE PC! Or you could get a PS3. Hmmm...that's an easy one for me!