I would have to say that my favorite of Jerry's girlfriends is, well, "shmoopie". I forget her name, but it was pretty funny when the Soup Nazi kicked her out of the store and Jerry pretended he didn't know him. My fave boyfriend of Elaine's is the closetalker too, and Kramer's best girlfriend was Connie, the one who had him thrown in the river. I would have to vote for George's bald girlfriend for his best one.
Mark