You should get at least one sports game, if i didn't have FIFA i would be so desensitized from only playing shooters, a racing game never hurts either.. Anyways you should get...

1. Assassin's Creed

2.Mass Effect

3.Call of Duty 4

4.NBA 2k8

5.Forza Motorsport 2

This is basically sticking with what you picked though cause you would know what you want best.