>>1090589>>1090756(Cont.)
There is really no such thing as overkill with an E-bike. The law mandates that E-bikes are restricted to a certain speed and wattage which is irritatingly low. You want to get a bike that gives you the maximum power allowed.
However, you have to be careful here - in the US (which is where I assume you are), each state (and even some cities!) have their own speed and power limits which you must be careful to stay inside of. One of the bikes you linked goes 28 mph - which is illegal in most of the 50 states. Don't buy an illegal bike - your chance of being caught out by the police is practically zero (most police don't even know what an E-bike is, let alone what the law says about them), but if it happens you will not be happy about it.
The most common scenario here goes something like this: You're out riding around one day and some asshole hits you with his car. The cops show up to assess the accident. They discover that your bike is illegal and slap you with a huge fine, or maybe even some more serious consequences depending on the situation. Your insurance company makes the same discovery and disowns you. So you're out a bike, you're probably injured, you're paying thousands in restitution to the state, and nobody will help you pay for it. It's not a great result. Try to avoid it.
Anyway, as for the bikes you linked:
>SondorsA lot of people think they look cute, and the price tag is attractive. Unfortunately, these bikes are complete dogs.
>CrossCurrentThis one seems fine for your purposes. The 350W motor is a drag, but since you live in a flat place you may not actually care. However, this is the 28 mph bike that may not be legal where you are.
>RadCityAnother dog. Everything on that bike is cheap, and it's heavy (60 lbs...a bike should weigh around 40). Avoid.
These bikes may be out of your price range, but they are what I generally suggest to people as an example of a quality E-bike:
https://www.prodecotech.com/ 
