Hi Nic.
My wife has owned a Juicy Classic for nearly a year now and I fitted an Ezee kit to my Giant bike a few months ago so can hopefully offer some practical opinion on two of your choices.
My wife is still loving the power and assistance offered by her Juicy Classic, even more so since I retro-fitted a thumb throttle to help her with startups and tired moments when she wants a break from pedalling, like you have mentioned. Bob also offers a throttle option on new bikes as well.
The Ezee kit I fitted was one of the dearer options but after 3 months of daily commuting I'm glad I chose it. I'm not sure if Ezee bikes can be de-resticted from 250w to 350w like my kit (purely for off-road use of course..), but the power provided in either mode is one of the strongest for a hub drive that I've ridden, and I've demo'd quite a few in the past year. I believe the Ezee kits and Ezee bikes sells are identical in spec and power, which makes the full bikes remarkable value as they're virtually the same price as the kits !
So to sum up both Juicy or Ezee bikes should give you the power you need with the step-thru style, throttle-only control, reasonable weights and more importantly prices.
Good luck with your search.
Regards,
Phil.