Thanks for the remarks guys.
650A's are 590mm, 650B's are 584mm, smaller. Medium reach brakes work fine with 650A's
Everything is more expensive with 650B.
In the picture above it is set up very upright, but this frame is a little more racy feeling. I set it up this evening with a dirtdrop stem and flat bars, I have to lean forward a little, but the bike flies with very little input. The ratio is 42-18