Still looking into that.  In moments of insanity I have considered a dirtbike hub as I can use a spoked rim, the hard part is the spacing is much different.  Being as I haven't invested any money into the rear disc (other than the rearset with MC) I am still looking at the options.  Part of the spoked/unspoked is I will need to get a matching front wheel.  My wheels need new spokes and rims so new wheels aren't too far out of the question.