Alternatively you could just buy a new rim and spokes and lace it up, using the old hub. (If you know how to build wheels).
There is a good book "Building Bicycle Wheels" available from Amazon if you are interested.
Been there, but Dans comp is way too expensive. i just need to know if a wheel like this works with a microdrive sprocket: http://www.niagaracycle.com/categories/xlc-y-303-bmx-rear-wheel-20-x-1-75-freewheel-red-black
Seems like a hard question to answer and that you have to go by the images.