It kind of depends on the types of games you play. I really like Sims games, so i would get Sims 3 if i were you. The next game on that list i'd get is a close one. Do you mean Gran Turismo 5? Because i don't want the 4th.
If you mean't the 5th GT, i'd get that. If you mean't the 4th, i'd rather get Forza 3.