I myself looked into a generator, so I could tell the electric company goodbye. Propane generators run cleaner, and run quiet compared to a gas generator...just be here when the lights go out across the street. (We live in NH, but across the street is ME. They lose their power more often.)
Listening to my neighbor's generator for days is unnerving! I think your neighbors would approve of a quieter generator.
I am not sure how many tanks you would need. We use very little electricity here, so there is no comparison. We were going to have a 200 lb tank put in, and that would have lasted us quite a while. You could probably call a local propane company to help you out.