Which 32GB set will you go for?
Going to have to shortlist some MBs and make a decision at some point myself!
As with the motherboard, I've haven't got much of an idea yet (I'm going to wait for the dust to settle before I start pricing up my final build).
My current memory is the low profile Corsair Vengeance so I might go with 3600Mhz of that. Too early to say.