Which to get

 So Christmas is coming up and that means presents! But, my Christmas budget is pretty limited compared to previous years, so I can only afford one game. The choices are Modern Warfare 2 or Left 4 Dead 2. It's a pretty hard choice since I loved both Modern warfare and L4D. I know they haven't come out yet, but at this point in time it's pretty easy to make a predictions.
 
So which do you think is the better deal? MW2 or L4D2 (Left 8 Dead?).

Get Left 4 Dead 2- the online community will be best at the beginning. Then, pick up MW2 when the price drops. Or the other way around.