Congratulations on the nice looking set of wheels. I am almost certain that you will love these wheels because I have built up these wheels two more times since the first set.

1) 2011 HED. C2 rims, black Sapim CX-Ray spokes F28lacedx2 and R32lacedx3, red Prolock Hex nipples, black WI MI5/H3 hubs, +6000 miles (perfectly true and not requiring any adjustment since mile 1 almost 18 month ago)
2) 2012 HED. C2 rims, silver Sapim CX-Ray spokes F32lacedradial and R32lacedx3, brass nipples, silver WI MI5/H3 hubs, 500 miles on them
3) 2013 HED. C2 rims, silver Sapim CX-Ray spokes F32lacedx3 and R32x3, brass nipples, and silver WI T-11 hubs (waiting for an 11-speed build)

So the question now is what tires are you going to put on these wheels?

I have tried several tires on them:

1) Continental TT 23c - these expanded to 24.5 mm, which were very, very smooth rolling, but lasted only 1000 miles (95-100 psi front, 105-110 psi rear)
2) Vittoria Open Pave EVO CG 24c - these expanded to 25.5 mm, are very smooth rolling, and the rear tire lasted 2500 miles (90-95 psi front, 100 psi rear)
3) Continental GP4000s 25c - these expanded to 27.5 mm, are smooth rolling but not as soft feeling as the Vittorias (80-85 psi front, 90-95 psi rear), 500 miles so far

I also am waiting to put on some Vittoria Corso EVO CX 23c and 25c tires on these wheels.

I weigh 200 lbs so your pressures could be lower - I have only had two punctured flats and a final flat through tire threads of the Continental TT when I decided to replace them.

Try to find the most supple tire and thinnest inner tubes and ride them at the lowest pressures you dare - the smoothness of tires on these wider rims will blow your mind away.

I have used only Vittoria Ultra-Light Butyl 20-23 inner tubes for all of these tires because I was not bold enough to use latex tubes, which should only improve the ride.

These wheels were supposed to be my training wheels while I decided on (and saved for) a set of carbon wheels (ENVE 3.4 tubular) - however, I still kept on going back again and again to these HED. C2 rims!

Ride them in good health, ride them safely, and ride them like your stole them!

Mark