I like the Executive Office track and the Trials track, but I'm listening to queen right now!
But it really depends on my mood. I'll take the soundtrack with me, and I'll listen to slig barracks in a busy grocery store, or bonewerkz at an empty school cafeteria, or Mudomo Vaults while in the back yard, etc. I love game soundtracks. I incorporate them into my everyday life. My favorite game soundtrack that still hasn't been topped even by abe's exoddus is from the game, Descent. But right now Queen is making a Supersonic Man outta me! lol