Mmmm. You need to add 7,200 square feet to your home. Huh. Given that my wife and I are massively comfortable in a 2,400 square foot house... I don't know how a normal person is equipped to help you make your decision. Comparing storing 2,400 square feet of stuff and a 2,400 square foot garage without a Hellcat to having an awesome car you can drive at-will... I dunno. Doesn't seem right, but it's your world.
As for the business expansion, well, I've always understood that shouldn't be dipping into personal resources.