FWIW, I got my rear wheel from aebike.com... a Handspun wheel made with Velocity Dyad rim and Shimano Deore LX hub. I haven't been touring on it yet (a tour WAS in the cards until a death in the family this summer sidetracked those plans), but it's taken well over 3,000 miles of commuting and general purpose riding so far w/o any broken spokes. I trued it up once at the co-op on my own and another time had it trued and retensioned at the LBS (coop didn't have a tensiometer at the time). I weigh in at 290 or so - add my bike and all my commuting gear (change of clothes, lunch, etc.), and you can see the wheel can hold up to quite a bit. I paid $125 for it, I think. Shipping was included.

The Dyad is a good touring rim, and I bought it on recommendation from several experienced Clydes, so you know it's built to hold up to the weight. Handspun wheels are hand made, just at a centralized facility. I've been reallyou happy with it after a year of constantly breaking spokes when I first started cycling. If you're on a budget, that may be a good way to go. Just a thought...