I only have the standard version of CIV IV, so I would have to say Bismark/Germany, Gandhi/India, Peter/Russia, Louis/France, Cyrus/Persia, Julius Caesar/Rome. Approximately in that order, with Bismark FAR ahead. Russia and France are about the same. I usually focus on wonders more than anything, so industrious civs win, and when I want to play higher lvls, AI interaction is vital, so I try to found as many religions as possible and spread 1 particular one to get some friends, so Gandhi is great in that respect. Peter is Phi/Exp, so I don't really have to worry about expanding my civ to get a lot of health resources, and I can finish production with engineers more often than not. Cyrus just starts out in a good location, and also, he is very rarely crimped by neighboring civs being too close because of the creative aspect. I play Louis for the same reason, and he's also industrious. JC is for my war games, because Praetorians rock, and you can put out more army on the higher lvl games (and I play Deity, so my treasury is a constant concern).
That's just my 5 (or 50) cents. Hope it helps.