[dibbs]

Assassins Creed would without a doubt be my pick if I had to choose before winter break, it's a lock baby.

If you are a big Bioware fan Mass Effect is a definite option though, I wouldnt get UT3 unless you were a rabid fan, CoD4 looks like its gonna be sick but chances are won't last you long, and Kane could still suck IMO or be annoyingly flawed in a lot of ways (it is IO Interactive afterall).

I agree that while Bioshock was sick, it was addictive and short, and it's one of those games (IMO) you'll have to wait a while for to get your replay value out of it.