Thinking about getting Solar Panels??

I was looking into Solar Power for my house and thought it would be really expensive until a friend recommended SolarCity (http://www.solarcity.com/). I typed in my address and zip code, described my roof and which direction the house faces and voila it comes up with an estimate. I could lease the panels for $56 a month, or with a minimum investment of $2425 I could pay $25 a month, or after all the state and local incentives I could buy outright for $5913. I thought that was pretty good compared to some of the systems I have researched. Here's the breakdown;
Initial System Cost: + $ 21,326
Federal Tax Credit: – $ 6,398
Local Incentive: – $ 9,016
Final System Cost:* = $ 5,913