20k Generac wholehouse from generatorsdirect.com. Comes with an automatic switch gear. Runs on natural gas or propane. I got one about a year ago and it works just as advertised. Cost about $4500 delivered and another $1K for an electrician and plumber to install.
FWIW: during Katrina, power to the pumps associated with the natural gas distribution system quit, leaving many without natural gas. Caused great havoc to the PD radio system, which used NG powered generators as a backup because Nimbies objected to them having propane at the repeater sites.