It'd say none of the above and go for another exclusive that sold well. And that is inFAMOUS. I found it very lacking. However I have a lot of faith in sucker punch and I'm expecting a lot from the sequel.

As far as multiplats go, MW2 is the obvious choice.

I definitely recommend Half-Life 2. It's (for me) the best FPS ever created. The original Half-Life is also very good.