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Thanks for the response, Ryan. I'm leaning towards Joomla! as they seem to have more options for each feature and a more supportive community, which I will certainly need.

Hey Joe, I noticed the same thing (large drop in indexed number/percentage of pages) a few days ago and thought that was related to a ranking drop I have experienced.  All I did was resubmit all (tag, category, posts) sitemaps via GWT and the next day Google had almost 100% of my submitted URLs back in the index.  However, that didn't fix my apparent Google penalty issue so I'm still searching for a solution: http://www.seomoz.org/q/help-with-diagnosing-google-penalty Oh, this was with a wordpress site utilizing Yoast's WP SEO plugin to create XML sitemaps.

We just found this, which may be helpful. It was exactly what I was looking for. http://www.monperrus.net/martin/list+of+robot+user+agents

I as well had a Spyfu account. I wasn't impressed. The numbers are pretty inaccurate. The best you can do is get a very ballpark range of spend. However, I'm not sure there are bulletproof sources for this information outside the walls of the paid advertising provider anyway. I could be wrong though.