Everything else, as far as I can tell is XenForo (staff titles, footer trademark, splash page, forum titles, etc.)...Which one is it going to be?
Ultimately we'll need to come down to one official way to capitalize the name, of course...right now I don't think we have it. I threw a poll in here just for fun. Maybe the XF guys haven't decided themselves and a little feedback from the community would help.
I personally prefer xenForo. Looks a little more modern/playful.