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BTW, Kanoodle and Xuppa didn't work out. No conversions off either of their traffic streams but I did get a ton of "your account is out of money" warnings from Kanoodle when I decided to stop using it. :)
ah-ha.com is the same way only with more traffic. Their bids are still reasonable and they seem to have increased their quality as of lately. We'll see what the future holds.
About other 2nd teir ppcs. I think you've hit the only two worth talking about.