1x9 or a full drivetrain? I'm going to try to get a 1x9 "kit" together next season that I can quickly put on the bike for really hilly days. I can guess which company you'll opt for but I'll probably just go XT/XT and run full housing to keep things simple.

PS. So ... the new Dura-Ace is going to have a chain with a master link. That M.L. is also going to be backwards compatible w/ other Shimano chains. That is all.