Well I have some experiance in this stuff, living in hawaii we also have power outages, and when I got my new house I convinced my wife that we should get a standby gen set.
I would not recomend getting a propane set up unless you have accsess to natrual gas and plan on running your unit on that as propane will not last as long and is more difficult to store, also during a natrual disaster propane will be the #1 or 2 fuel in demand for cooking and heating. I would recomend a diesel gen set, that is what I have, diesel is far eaiser to store and has a longer run time, it also has the advantage of running at only 1800 rpm verses gas and propane that needs to run at 3600 rpm to maintain 60 hertz output.
diesel is also quieter for this reason.
the only draw back is cost.. for a comparable sized unit a diesel will cost 25-50% more.. but will last longer than a gas or propane unit.
I got my setup from a company in florida called Island generators ther web site is
http://www.islandgenerators.com/
here are a few pics of my installation..
joe:rock: