Spoke with my LBS this evening and my guy suggested a Mavic Aksium wheelset. Funny thing is, I used to own a 2005 Specialized Tarmac which had Alex ALX 330 wheels on it with 16 spokes in the front and 20 in the rear which is exactly the same spoke count that the Ultegras have. I weighed a lot more then and never had a problem with the wheels.