I've been VERY happy with the Dura-Ace hubs on my current wheelset. They are lighter than Ultegras. Also, being cup/cone bearings (loose balls), it is easy to service and easy to adjust bearing tightness. Everywhere I went online to check out the possibilities (and get weights), I kept toying with Dura Ace again but they were the heaviest of the hubs I was considering. DT is a fine hub, and easier to service, if you are looking to do it yourself, than CK. I agree with what others here have said, 28/28 and find out about getting 3x driveside. After all, these are custom wheels, the builder should be able to do that. You could also do aluminum spoke nipples (but brass for the drive side rear). If the roads are less than nice, and saddle hours long, it's nice to know the wheels can take it.

So many choices, no wonder it took me a month to get it sorted out. Good luck!