Open Pros are an anachronism. Build with a newer deeper rim, such as a Kinlin 30mm and unless you are a total clyde, go with 24 spokes in front and 28 in the rear. You'll end up with a stronger and more aero wheelset that weighs about the same. Also use Wheelsmith DB14's. They are a bit more strongly butted than DTs, cost as much or less. I build with them and IMO they are better than DTs.