I want to buy 2 games for my xbox 360 but i dont know what games to buy?

These are all possibilities
Gears of war 2
Fable 2
Saints row 2
Rainbow six vegas 2
Sonic unleashed
Need for speed undercover
Forza motorsport 2
Far cry 2
i like all kinds of games like shooting,action,racing and open world games which 2 games do u think i should get