I think you should finish up your Bioshock series and get Bioshock Infinite. The Last of Us is another must play if you have a ps3. Max Payne 3. The Resistance series. Far Cry 3. Borderlands 2. Killzone 2 (3 is not bad). Dishonored. Metal Gear Solid IV. Elder Scrolls V: Skyrim. Uncharted 1 and 3. Dead Space 2. Heavy Rain. Did you like Nino Kuni? I just bought it the other day and it looks like an amazing rpg.
Good list so far, you have a lot of my favorites. I'd recommend Bioshock Infinite, Skyrim, Heavy Rain, and Journey (the collector's edition is probably cheap now and comes with some extras). The Last of Us looks good, but I haven't played it yet.
If you have friends/roommates to play with, then don't pass up Borderlands.
RIP Maisey, my sweet little hedgehog. 12/22/08 - 02/13/12