What would be the most important financial factor in your purchase of a solar energy system for your home or business?

	Upfront Cost
	Final Cost (Upfront Cost minus Tax Credits)
	Payback Period (How long it takes to pay for ­itself)
	Return on Investment and/or Internal Rate of ­Return
	Amount of Electricity Savings over life of sy­stem
	Financials would have nothing to do with my p­urchase