Hi Glynn,
I see your posting was last January, I wonder if you have now purchased your ebike?
I have just bought a Powacycle Lynx see link
Lynx LPX Electric Folding Bike , so far very pleased with it.
If you live in a very hilly area, I would recommend a motor of at least 200 watts, 36 volt system and a li-poly battery. I have found the 180 watt 26 volt system coupled with the li-pol battery, will give enough assistance on hills for me to pedal right up them.
You might also consider the chain drive models rather than an integral hub, some chain drive models, I read - will allow the use of your gears, this would improve hill climbing ability.
Regards Terry