I was quoted around £200 to build a pair of Open Pro rims, (32 hole I think), with 105 hubs, but I wanted the Hope hubs instead, big mistake, the freehweel is so damn noisy!
The Halo Aero Rage wheels are cracking value IMO. A rear wheel from
Wiggle is currently £107.99. It's built with 32 double butted spokes, sealed bearings and a 6 pawl freehub assembly. In a nutshell pretty much bombproof.
I've used them for a few years now, and part from having the rear one tweaked once after hitting a sunken grid they have run perfectly true at all times. I can't recommend them highly enough