I found a Yelp review of Electric bike solutions- appears to be a dealer in California. I have not heard of this Vendor, SO I think he is not well known around ES.
http://www.yelp.com/biz/electric-bike-solutions-llc-fairfield
Maybe you could contact him with your question, I believe his name is doug. My guess is that motor is an upgraded BPM (bafang).
I do think that is a good price, but someone with your bike skills could build a kit cheaper. I think with your size, and the hills, that a direct drive motor would be better for you than a geared. geared motors do not shed heat as well as DD motors.
there is a company Wes reccomends to budget minded builders called yesusa.com
http://www.yescomusa.com/Brushless_Electric_Bicycle_Engine-_48v_1000w_Rear_Wheel_Hub_Motor_Kit.html
They have cheap dd motors and have been recommended by others.
Batteries are another story, I can personally recommend ping battery, Em3ev and ebikes.ca for batteries. Others will hopefully chime in there recommendations. A good battery is required, should go with a recommended vendor, esp for batteries.
Where in maine are you? I live in MAss and have some used 9C DD hub motors hanging around, If you are on a tight budget. I could part with one and a controller cheaply. But they would need a new wheel build, and some soldering may be involved. I would not ship but would meet half way if you wanted.