just to sum up my decision, i decided not to get the airplays with built-in DAC (from Kef), because I'd have no volume control except at the speaker location. So I've cancelled the Kefs and have some nice wired speakers that should arrive tomorrow. Then I'll run wires under the floor to the speaker location. Then, assuming I like the result, maybe one day I'll upgrade to better than nice.
I'm kind of sorry not to get to try the wireless ones but I wanted volume control.
Thanks!