This looks pretty good, but for me my biggest hurdle is that I've been using cPanel since forever. If I were to switch, what would be some things that I should know?
Dude, set aside a couple of afternoons and for $5 get a slice and just try out the various open source panels until you find one you can live with and cut the cord to CPanel. Plenty of info on the DO forums. Unless you're reselling to a bunch of chimps wearing diapers, you don't need CPanel exclusively.