I've bought some Continental Grand Prix 4000s for the Triban 3 and I am currently getting a wheelset handbuilt based on Shimano 105 hubs and Mavic Open Pro rims. The Conti's were £22.41 each from
http://www.bike-discount.de and the hubs from Rose bikes.
http://www.roseversand.com/ front hub £15.93, rear hub £27.09. It saves nearly 1kg on the wheels. Also changed the front brake pads for a set of Rose triple compound. A saddle is on it's way from Taiwan.
I've done 700 miles on it since early August and it makes a nice change from my touring bikes. Love it.