No further forward in making a decision, but if going folding electric, this looks quite appealing - Pedibal Navigata CitE Instant Throttle Folding Electric Bike
It's important to choose between a motor that responds to the torque you apply to the pedals or one which is a bit like a moped. This one sounds like a moped. Almost all cyclists will sat the torque style is best because a) it feels more like riding a bike with a tail wind and b) it is safer and will help you get fit.
I've seen irresponsible people with throttle e-bikes piling along busy shared cycle paths at speeds they couldn't achieve with their legs.