Here's the AtoB Magazine Electric Buyer's Guide.
Today I test-rode the Giant Twist, and the eZee Cadence. I learned that I don't like pedal-assist, I like an honest throttle. A 350W hub motor in the front wheel will get me up the paved section of my hill (but probably not the dirt, which is steeper and... well... dirt). I preferred the eZee to the Giant, overall. It was slightly cruder, but I just liked it more. Cheaper too!