Kit is the best value. I paid about $1000 for my 1000w motor and 48v 15Ah LiFePO4 battery. Bike cost is up to you. A full suspension mountain bike would probably be best for those speeds. Max speed I can get is 32MPH, but I'm on the smaller side. I can theoretically go 25-30 miles on a charge at 28MPH (never ran it all the way out).
The federal power and speed limits for ebikes are generally considered to be meant for manufacturers of complete ebikes. Check your local laws and don't ride like a hooligan and you shouldn't have any issues.
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