Right now I have the cash to buy 3 games :)..Help me choose 3 games from foll

1>The Orange Box

2>Bioshock

3>Gears of War

4>Crysis

5>Call of Duty 4

6>Mass Effect

7>The witcher

8>Unreal 3

M mainly looking for 10hrs+ of single player action..also good multiplayer..