Well you like Tomb Raider, i would definitely recommend the uncharted games on PS3.

I see you got Gran turismo 5 Prologue, unless you want to just wait for GT5 this year, I would recommend Need For Speed: Shift, seriously, try the demo on the Playstation Store

As far as RPG's go I can absolutely recommend Vaklyria Chronicles, but you might want to check White Knight Chronicles as well (both PS3, not related).

i can vouch for Assassin's Creed II as well, just finished it and it's one of the richest experiences I've found this generation, but you might want to play the first one because it does add to the story a little bit, plus its cheap as hell now.