I had the System 19s from Williams Cycling.
I second the Williams. Keith is an amazing person with customer relations- he owns the company and answers phone calls personally. The 19s were great, light wheels, with quick acceleration.
All of the hubs are ceramic-hybrid bearings. I used them for training, climbing, and crits- couldn't think of a better wheelset in that price range.

You could also build up a pair of Mavic Open Pros, they would be a durable set of wheels.