Selection of Home Generator Systems

[Don]

RE: Back Up Home Generator Systems:

Hurricane Irene in CT caused extended power outages. Approx 55 % state wide outage from Aug 27th and the last power predicted to be 100% restored on Sept 7th. While the length of the outage and damage in the entire state was not the norm, started to review, pros and cons, back up home generator systems. Towns made schools etc., available for showers, water, hot/cold meals, lodging etc. Local gyms offered use of their facilities at N/C . UCONN Women's Basketball Team sponsored a community dinner, over 500 meals served. Considerations so far:
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* Transfer switch application at the circuit panel, not multiple extension cords from the generator to the devices
* Electric start
* No natural gas, would need to use either propane or gasoline powered, ease of refueling
* Capacity to exist, monitor usage by shutting down appliances etc
* Selecting a company that sells, installs and services
* Minimum capacity for the essentials such as water well pump, furnace, freezer, refrigerator, 110V items, microwave, one element on the electric cooktop, etc. A/C would be a plus when managing overlap usage.
* 110V & 220V
* Exterior location, permanent mount or on wheels and then connect power cord to circuit panel transfer switch.

Any advise, comments and other considerations on the selection of a generator system, etc ?