At your weight 36 double butted spokes are the way to go. They should be tensioned to at least 100kg on the drive side. This is a good set. A friend has a set and he is over 250 and carried over 50 lbs on a short tour.
WE635 Premium 8-/9-/10-speed Shimano D-LX T660/Mavic 36
http://sheldonbrown.com/harris/wheels/622.html