I bought a set of these for my commuter and they are decent:
http://harriscyclery.net/itemdetails.cfm?ID=1676

They were straight and true and not bad for the price. They are not light, or "roady" but they would work.

I've also bought a wheelset from Universal Cycles. You can pick all your own parts (or call them for very helpful advice), the prices are reasonable, and the quality is OK in my experience. Maybe look at something like the Sun CR-18 rims with Tiagra hubs - this would be around $175....

http://www.universalcycles.com/wheelkit_new.php