Tbh, pro vibe, as I'm a sucker for Matchy Matchy, the pro vibe stem is the main reason why I want to change my handle, as finally they will do a -17 1 1/4 stem for the Canyon.
I'm always a sucker for aero, but I do like the pratical side of the traditional handlebars too:
Nice! I really like the look of the new Vibe stuff, and it seems they flared the bar ends for the bar end junction. Does this mean that junction won't work on normal bars?
you can find all the compatibilities in Shimano's handy compatibility chart:
http://e-tubeproject.shimano.com/guide/#guide_list (scroll down a bit for the latest version)
What bars are you getting?