[MENTION=20478]dbg[/MENTION] I was really torn on the brakes, I finally followed my builders wishes and went disc. I think either choice was good.
I have not tried Paul brakes but I'm a big fan of the Avid Shorty Ultimate and its easily adjustable tensioning. I also think it might be possible to have canti posts positioned so that either 26" or 650B wheels are supportable on the same build.
[Oops. Disc brakes already chosen. Feel free to delete this post.]