I got a screaming deal on 36h XT hubs from AEBike.com to go with Velocity Dyad rims. I got the rims from Airbomb, but I don't recommend dealing there. I'm building them up with DT Competition butted spokes from Jenson.

I chose the Dyads over 719s because I don't carry a 50 lb tour load and I wanted to save some rotating weight.

I got the XT's because they're light enough, very strong and serviceable just about anywhere, and they don't scream "STEAL ME". They do everything I wanted except for having sealed bearings, and that was not high on the priority list.