Skyrim will definitely give you the most bang for your buck. Arkham City will also be a definite purchase, for me at least. Also getting BF3, and maybe AC: Revelations...I'm gonna have to rob a bank. Or get a better job :)
I'm most torn between Skyrim, Assassin's Creed: Revelations, Battlefield 3, Modern Warfare 3, and Saints Row 3. I want all of them, but I can't see that happening unless I win the lottery or make a fortune in some other manner.