Since I have both systems (PS3 and XBOX 360) Its sumwhat hard for me to make a decision on what console to buy the games on, but I must say, I love the achievement system on 360, it'll soon go to the PS3 though.. anyway, let me get to my list
1) Halo 3
2) Madden 08
3) Assassins Creed
4) GTA4 (might get it for the PS3 though)
5) Call of Duty 4
6) Devil May Cry 4
7) Strangle Hold (might get it for PS3)
And that a total of $420.00-- without tax...DAMN I gotta start saving up from now Hahaha!