For an everyday rider the corsa kit is all you need and it is port matched, the spree fuel tank is small & the brakes suck, with the right parts combo you will hit 75mph, the 85cc Taiwan kits don't last long due to the metallurgy.
Heh. In MI, you're lucky to get that many miles on a scoot in its lifetime. 6 month riding season. That's why there are so many low mileage scoots here.