If I lived in town a 36V geared hub setup would have more appeal for me. I went with a E-bikekit.com rear direct drive setup as the majority of my riding is rural. The higher speeds possible of direct drive was the deciding factor.

All the rear kits I've seen require a freewheel. A cassette won't fit. I bought a 7speed freewheel. It was wasted money. I leave the front chainring on the 48 tooth sprocket and only need 6th and 7th on the rear. I may eventually go with a 60 tooth single front sprocket as my cadence gets up to 100 at about 60% power.