Why not do something like madlibs? Configure about 10 or 20 unique variables describing each page. Then, write a paragraph which contains those variables, effectively giving you 400,000 unique paragraphs.
For example:
page 1:
$title = "Yorkshire Terrier"
$price = "$800"
$weight = 6
page 2:
$title = "Maltese Spaniel"
$price = $1200"
$weight = 4
output:
"Welcome to my page about the $title dog. This breed usually costs around $price. Adult $title's typically weigh about $weight pounds."
If you configure enough variables, you'll end up with a lot of keyword rich, unique content. If done right, the only words that will really end up being in common are words like "and" and "the" and other short phrases that the search engines are more than likely to simply dismiss and focus on the unique quality keywords.
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The Queen of DaniWeb
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