Good to come aboard the Microsoft train!!!!
Okay on a serious note here is the list of games that are budget but are good:
Call of Duty 2
Call of Duty 3
Final Fantasy XI
Enchanted Arms
Dead Rising
Project Gotham Racing 3
Marvel: Ultimate Alliance and many more just can't remember its just so many!!
Okay serious must-haves:
Halo 3
Rainbow Six Vegas
The Orange Box
Gears of War
GRAW 2
and many more I'm at work so its hard for me to stay focus.
Good to see that your a 360 owner Origin. 8)