I just ordered a new Mac Pro 2.66 WOOT! I wan't a game to start with until I get windows in bootcamp. It's either gonna be Age of Empires III or Civilization IV. It looks like I can't get a cross platform disc for either game so which should I get for Mac? I'm concerned about mods because I assume there are more mods for windows and I don't want to buy a game twice just for the ability to use mods.