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If I am trying to assess the difficulty of ranking for a longtail keyword phrase that is 3 or more words long, should I put that phrase in quotes when I enter into the Keyword Analysis Tool or not? For example, let's say I want to see how hard it would be to rank for the phrase "best educational resources for teachers". Should I enter into the keywords analysis tool as "best educational resources for teachers" or just as best educational resources for teachers? Which one would give me the most accurate difficulty assessment for that phrase?

SeoMoz reports over 70 4xx client server errors on my site, but Google Web Master Tools does not report any broken links. There are not any broken links on any of the pages that it is reporting. Could there be another reason for the 4xx errors besides broken links?