I've been looking around for some solid wheels as well. My commuter/cross bike has a 7 spd cassette and a 130 mm spacing. That makes for a strong wheel. I've been riding that wheel on and off since the early 90s since it came off an RB-1.
Still it's time for a new wheel and I'm thinking a 36 hole dyad is a good choice. Universal Cycles has a good selection of wheels and the prices seem reasonable,
http://www.universalcycles.com/shopp...5&category=245.