STALKER: Call of Pripyat.
Mass Effect was alright, but it was a rental and I got sick of it by the end of the week, so I may rent Mass Effect 2. Bioshock was okay, but I've tried playing through it again and it just seems to lose it's shine after the first play through. Too much linear story, not enough free choice. So the second will probably be a rental, or maybe a purchase when it's down to $20. The STALKER series has a nice balance of freeplay and story, and I love post nuclear meltdown Ukraine coupled with difficult gameplay and firearms and ballistics that are relatively accurate to their real world counterparts. Other than that, I'll probably get Diablo 3.