-Call of duty 4

-Kane & Lynch

-Dirt

-Madden 08

-TimeShift

-NBA 2K8

-Halo 3

-Mass Effect

-Assasains Creed

-Bioshock

-Guitar Hero III

-Rock Band

-Orange Box

-Virtua Fighter 5

-Soilder of Fortune

-Gears of war

-F.E.A.R

-Rainbow six. Vegas

Well, even if you just buy the premium xbox 360, it comes with Forza motorsport 2 and Marvel ultimate alliance.

These games are also some must buys....

-Halo 2

-Call of Duty 4

-NBA 2K7

-Bioshock

-Gears of war

You probably want to pick up an extra controller too.