Hey wait, LBP is mine too!
I was going to say that you must absolutely get Valkyria Chronicles, but it has already been done I see. So how about some PSN games? Crash Commando, Wipeout HD and Super Stardust HD are pretty fun. I heard Flower is a masterpiece.
Random game thought :
Why is Bionic Commando Rearmed 2 getting so much hate? We finally get a real game and they're not even satisfied... I'm starting to hate the gaming community so f****** much...