A few years ago, my neighbor offered me solar panels that he wasn't using. I thought that was cool and I looked into what I'd need so I could use them. At the time, I'd need some stuff and batteries - that batteries are more important than the other stuff because they are so expensive.
If the neighbor was still there and was still offering the panels, I'd take them now because it sounds like you don't need batteries now. My understanding, based on a brief discussion with BB, is that Xcel will buy any excess electricity generated so there is no need for batteries any more. Cool - too bad the neighbor moved!
I just read about a new option today on Wired. I was actually enjoying this excellent article, Thanks to Google's Tools, I'm the Most Efficient Time-Waster Ever and then I spotted this article, Selling Homeowners a Solar Dream. Pretty interesting stuff: this new company puts everything in place and you agree to buy your power from them at a fixed rate.
Citizenrē - take a look - interesting.