On top of my head:
Your first objective is, by all means, get either Dead Rising 1, or the Dead Rising Collection.
Lost Odyssey is a must.
Tales of Vesperia is another must.
Then you have the worse-received Infinite Undiscovery, which I liked. I suggest you look into that one as well.
If you haven't played it already, or your PC can't handle it, The Witcher 2 is a nice option.
Gears of War Judgment isn't that bad. I suggest you grab it if you can. Viva Piñata is okay, actually fun at times. See if you could grab Kameo: Element of Powers as well.
If you didn't get it for Ps3, DRAGON'S DOGMA! By all means!
Shadow Complex (XBLA game)
Geometry Wars 2 (XBLA game)
Ilomilo (XBLA game)
Dead or Alive 4 and Dead or Alive Xtreme 2 are nice.
With all those, and the ones you already have, I'd say you'll have a nice collection so far.
