My Mother (yes my mom) owns a Auth Kohler generator business in Richmond. She can have one installed that will power your whole house and have natural gas power it. It basically looks like a big AC unit outside - all for around 20k. I know thats not much help - so get a Honda
Heres a good site that will help you decide what kind of power you need
http://www.hondapowerequipment.com/gencho.asp