Don't want this to come off as an advertisement so I want to make it a little more well rounded. Spurred on by a link on the Chicago Cyclocross Cup site that referenced a Williams Wheels video....don't have the link ready but...
Williams has come out with a cyclocross specific wheelset. They appear to be using Kinlin TB-25 tubular rims laced to Formula hubs using straight gauge spokes 24f2X/28r3X for something like $369.
This sounded almost exactly like a set I was building for myself so I decided to go out and spec some wheelsets that I could offer people. I came up with the following iterations - all using the same Kinlin rim:
Ultegra Hubs 28f/32r - 1673g $299
Novatech Hubs (limited supply) 24f/28 or 32r Shimano or Campy - 1507g $315
White Industries H2 hubs any setup you want but I recommend 24/28 Shimano or Campy black or silver - $449
All are laced with DT Competition (butted) spokes and done in any lacing desired.
I have heard great things about Williams and know that their set represents a great value. I am just tyring to offer up other - different options.