Cummins and Kohler make some nice generator set packages for the home. Stay away from Generac. They offer both gas fired and diesel sets. They can be installed with automatic transfer switches which automatically start the generator when the power goes out and shuts it off when the power returns. All this will cost more, but it all depends I guess how much you are willing to spend.
Some of the larger Generac’s are pretty decent. You just have to know what you looking for. A standard car engine that turns at 1800 RPM’s can last a long time, particularly on propane or natural gas.