I've got good news for you guys(and me once I finally get the game )...
The DLC is going to be free for the 360!
Woohoo for valve not being greedy! I hope they keep up the trend on giving out free DLC, that was one thing that was keeping me away from the game.
Really tempting to buy this on ebay right now for $35... but it has no case and its condition is "acceptable"