The hubs used by DCR are Bitex as I recall. It is these (alongside the spoke choice) that tend to make the wheel set fairly light.
I have a had a few sets of these hubs over the years, but none at the moment.
The front does have small bearings. I never wore them out but as I recall they would have been fairly easy to replace. Mine ran nice and smooth in fairness. The hubs shells themselves did though feels just slightly cheap, but that is subjective.
Rear hubs were similar but I did get an occasional cracking noise, which I put down to maybe the pawl.slipping on pick up.
Currently own the Kinlin 22mm rims and find them fine. Nice and straight to build with.
They do a 30mm version as well and I think it is what Hunt use in their aero alloy set or something.
I think if you went alloy you may always be wondering "what if I'd have got the carbon Prime ones" (said as somebody who has never run carbon rim brake wheels).