When Civ3 arrives, choose the almighty civ in your opinion and start kick the crap out of the other civs all you want. I mean in the real world, hardly anyone is going to admit another civ besides their own is better, so why don't we use Civ3 the game to prove it?
For those who don't have their desired civs in the game, it's not because they are unworthy in anyway. It's only because of Firaxis's marketing choice, for example, maybe there aren't enough gamers from that part of the world to buy the game.
You can always pick up the civ editor, create your own civ and start kicking ass and show the world which is the supreme civilization.