I got involved w/ShowMeSolar (another non-profit bunch of do-gooders) and one thing I learned was that big "breakthroughs' hit the news regularly, but are often YEARS away from actually hitting the market. When these products do hit the market, they are the most expensive type of technology out there, so mere (financial) mortals should probably be looking at what's currently on the market unless they're willing to wait many years. Having said that, you might want to contact Jeff Owens of ShowMeSolar just in case there has been an extreme breakthrough that I just haven't heard about. email@example.com
Sorry for being a buzz-kill.
Hope that helps,