The previously mentioned HEDs are a good option as are other wheelsets with rims that are on the wide side. Wider rims get more volume out of the same tire vs a skinnier rim, which allows you to run slightly lower pressures, which can make a noticable difference in comfort for a big guy that would normally have to run high pressure to avoid pinch flats.
Are the subject of wide tires, what kind of tire clearance is your builder going to give you? At this point, I want to be able to clear 28-30mm tires with any future bikes.