bloomarty - 12:26 pm on Jan 27, 2011 (gmt 0)
I think there is a misunderstanding here that costs you a lot of time: landing pages have very little to do with quality score. They are only relevant in determining the minimum bid you have to pay. After that, for position and the price you pay per click, landing pages are completely irrelevant.
You can verify this on the AdWords help pages: "For calculating a keyword-targeted ad's position, landing page quality is not a factor."