In general, I am a big fan of buy the SMALLEST generator that will get the job done ! A 2000W-2500W generator is adequate for most residents. The big problem is well pumps, which require 240V. Two ways to solve this problem.
I completely agree. Low fuel usage, portable, cheaper (you can even have a backup!). Supply power to the things that actually matter.
What I'd like to see is a self-starting 2kw generator with a downstream battery + inverter. In that case, you are dealing with the real problem, the <2kw (typically much under 2kw) average use, while the battery handles the peak loads. With sufficient power saving measures, it would be turned off most of the time. The Chevy Volt generator.