Hey Cadaver-
Depending on your budget, you might consider buchananspokes.net. They have every size rim you could ever want, and they'll calculate the right size spokes to lace them on to your stock hubs. Plus, it's not as expensive as you'd think.
Building wheels is NOT HARD, really. If you study any number of how-to's on the internet and take your time, it's practically fool proof (Hell, I did it so it must be!).
You'd end up with the nicest wheels possible!
Sherm