The other option, which would save a tonne of shipping fees, would be to get the Onyx hubs I'm really interested in, but go with Boyd Altamont rims. This option would be closer to the Flo30 / Onyx I had originally thought of...I'd have to really low drag hubs, but not quite as aero rims (closer to the Zipp30 / Zipp 101) or I can go more aero with the Flo60 carbon rims, but more drag with the hubs.
Decisions, decisions. ;)
'12 Cervelo S2 (full Chorus, upgraded bars, saddle, wheels and tires)
'09 Knolly Delirium T (frame up custom)
'?? Mercury road bike
'06 Gary Fisher Cake 2DLX (signed frame)