you can generally count on traders on this forum for good service, like Cyclotricity, Cyclezee, Kudos, Woosh etc -
The Range handles 65000 lines in their mailorder catalog. The bike sold by Therange (CDS Superstores) is a one off, it's the best VFM bike out there at the moment but beware, the bike can potentially be of old stock, the battery may not have been kept in charge for a very long time.
The Powacycle Prague has 24V 10AH battery - pretty gutless. You would be better off with the £699 Cyclotricity Sahara or the £625
Woosh Santana for a step through.
I went for a "cheap bike" - the Woosh Santana CDL step through at £800. It seemed to me that spec was as good, or better than some at a far higher price. Are the components "cheap"? I don't think so.
I am a 95kg 67 year old guy, and have done 650 miles. The bottom bracket is smooth and has no play. The rims and spokes are the same as when they were new, with no broken spokes. The front disc, and rear brake are still performing well. The wheel bearings are smooth and have not required adjusting. The motor is quiet and sounds as it did on day 1.
The bike reminds me of a Lada! Basic looking, but seemingly pretty robust in the engineering department. I'm also a convert to step thrus. I think it's safer for getting on and off as it's a heavy bike. It also encourages a more laid back approach to riding. No Lycra for me!
The downside is obvious - you need to be handy with the tools which I am, because I can't take it the shop to be sorted. This would be an issue if you needed it 5 days a week for commuting. I did have electrical issues early on which I actually enjoyed sorting out with Woosh, whilst learning a lot about eBikes.
The only niggle is that the chain was not up to the job, in my opinion (others disagree) but it seems I'm not alone in this (see my thread "How long should an ebike chain last)
The bike came with a 15amp battery, bigger than nearly all the bikes under £1K. It's essential to buy a bike with the biggest battery (whilst bearing in mind the cost of course) because if you enjoy the ebike experience as much as I have, you'll be going further and further on each ride!