Dead Rising
Oblivion
Hitman: Blood Money
Dead or Alive 4
Ghost Recon: Advanced Warfighter

Once they arrive, both Lost Planet and Mass Effect look like being pretty sweet games, too. You say you're getting Gears of War as part of the deal - good. It's freaking amazing.

Edit: The disc scratching occurs if you change your system's orientation while a disc's inside. ie turn it from being flat to on the side. Don't do that, and they shouldn't get scratched.