If you do decide to get a 360, wait until Black Friday. Lots of good deals, then.
KMART - Xbox 360 60GB Pro Holiday Bundle + Free 12 month Xbox Live card for $299.99
DELL - Xbox 360 Arcade Holiday Bundle w/Rock Band 2 Game - $199.00
CIRCUIT CITY - Xbox 360 Arcade Holiday Bundle + 20GB HD & Wireless Controller $199.99 (plus, if you hit one of the stores that's closing, you'll likely get a percentage off, as well)
BEST BUY - Xbox 360 Pro 60GB Holiday Bundle with Tony Hawk Proving Ground & NBA 2k9 $299.99
LEFT 4 DEAD - November 17th