I'd suggest you ME2 over FFXIII, it's more shooter than anything else, with great story. Seeing your KZ avatar you might like it more. Unless you don't like playing on PC that is, since I don't expect you to have Xbox.
FFXIII will be super heavy on story, with hours and hours of cutscenes. I'd suggest you to first try some older FF game to get an idea what's the battle system like (it's different in every iterations, but might give you a hint).
MY HYPE LIST: 1) Gran Turismo 5; 2) Civilization V; 3) Starcraft II; 4) The Last Guardian; 5) Metal Gear Solid: Rising







