Ah awesome combo. Currently eyeing the MSI B350M PRO-VDH as it seems to tick all of the boxes for me, although coming from my black build i’m not sure the dark brown will look as great. My current set is Kingston Hyperx 4x4gb kit (I think they’re at 2666).
A second option could be trade out my kit for a 8gb x2 and then open up my options to boards with only 2 slots.