"Heroes" Fans: Who Is Claire's Dad?

Reader Boredatwork posted a poll in the "Addicted to Heroes" group, asking who fans thought Claire's dad would turn out to be on tonight's very exciting episode of "Heroes." Based on the brief glimpse of her dad's arm (top right) shown during the previews for tonight's episode, there is a lot of speculation that Nathan Petrelli might be her father. But if you look at my comparison of the two rings below, you'll notice some differences. Who do you think will turn out to be Claire's real father?