I am looking for a software that gives me more accurate information about how difficult it is to get on #1 page for a selected keyword phrase.

If I get a Wordtracker result of 20,000 competing pages for a phrase, then I need to know how many of these 20,000 pages are really optimized for the phrase and how well in order to get an idea how much effort I must put in to achieve a top 10 ranking.

I know this may have been asked and answered several times somewhere somehow. Question is where :)

Thanks

FFrank

Best one I know of is SEOmoz's Keyword Difficulty tool.