I'm afraid I know nothing about the HyBikes. Other than having heard the name a time or two before. I searched a bit. Here's one model I found.
http://www.bikemania.biz/electric-bicycles/hybikes-polarity-low-step-electric-bike/
A quick glance doesn't seem to show anything that's any more impressive than the cozybikes. (czbikes didn't seem bad, by any means. They just didn't really seem to be giants in the field.) This bike does seem to be notably more expensive, though. Though if their pitch is to be believed, it can be had with a first outlay of around $700. That's worth something. But then there's more payments in store. And that should be considered with care.
I suppose we ought to digress for a moment. You said that you were 290 lbs or thereabouts? Plus your commute will include at least one significant incline? That might be asking a lot of any cheap electric bike. In fact, it might be asking a lot of any motorized bicycle. The addition of a motor means that the bike itself is stressed beyond what it was meant to endure.
This does not mean that it can't be done. It does mean that it needs to be done with some care.
It could be that you should consider an internal combustion engine.
Here's something interesting;
http://www.bikemania.biz/electric-bicycles/honda-electric-city-bike-scooter/
I couldn't afford the time to take a closer look. But if that's a genuine Honda, then it's worth considering. And the price is not bad. When you take into account the name, you can be pretty sure that it won't be garbage. Though it still might not be super strong. It looks like it has rear suspension. A big plus. You should have a look at it.
If that doesn't look like it can do the trick, then let's talk gasoline engine.
We might want to do that in a new thread. That'll get others involved in the discussion.
There're a lot of knowledgeable folks here, eager to help.