El_Alto wrote on Jun 10^th, 2012 at 4:29pm:

No hurry, expectations are the prices will continue to drop for 40-50% the next five years. And around that time probably the new generation solar-panels (Yes, a Dutch invention  ;) will enter the market. The new panels will be four times more effective then the panels you can buy on the market today. Beautifull times ahead for solar-system lovers!

Well that's an interesting analysis. Considering panel prices have fallen several hundred percent in the last few years and the subsidised chinese companies are selling their panels for less than the cost of making them I can't see them getting 40 to 50% cheaper. Especially as the Americans have decided to put import charges on the cheap chinese panels and the Euroepean Union is currently considering the same thing. http://www.renewableenergyworld.com/rea/news/article/2012/06/asia-report-as-eu-trade-case-looms-market-could-shift-east
So giving your analysis the benefit of the doubt a 40 to 50% percent fall in prices and a 30%tax increase doesn't seem that cheap. In addition solar manufacturers are going under as they can't compete with the chinese companies and I suspect once the board is clear of competition prices can only go up again.
I hope someone does come up with a viable solar panel with more efficiency(current rates are only about 10 - 15 percent) at a low cost so we can all have cheap solar. But I note that Cold Fusion(really abundant, cheap,clean power source) is reckoned to be only ten years away! Though the interesting thing about that is they have been saying that since the late seventies.
Bruixot