I have the following games which I would like to trade for some good (purposefully vague) games:

Prey

• Solid space FPS (http://xbox360.ign.com/objects/744/744397.html) IGN: 9.0
  The Orange Box set
• This is the best reason to trade with me. This great game set comes with Half-Life 2 (episodes 0, 1, and 2) and Team Fortress 2. As if that's not enough, it also includes the indie game Portal which has won tons of awards and has a great gameplay experience, not to mention one of the best game credits songs ever. (http://xbox360.ign.com/objects/830/830467.html) IGN: 9.5
  Bioshock
• A fantastic FPS with a haunting story line. Seriously, the middle game where you meet the Founder of Rhapsody still makes me ponder. The change in gameplay they set up after this meeting is also unique among FPSs. (http://xbox360.ign.com/objects/793/793105.html) IGN: 9.7
  Xbox Live Arcade (This came with the Xbox. You can take it or leave it)

As I'm writing this, I'm noticing that all these games are high quality. Really, I'm just interested in playing some more really awesome games, so offer me some that you have beaten and recommend (for Xbox 360). Bonus if you can do this immediately (I'm on Stanford campus).