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Nice high level overview of what is out there. We decided to use CentOS because what happens if the maintainer of the various solo projects out there gets hit by a bus?
Also, if we decide later that we want paid support, there are at least 2 or 3 companies that offer direct support for CentOS. I have also had no problems getting my vendors to support their products with CentOS. It was a little dicey with Rational at first but once they "got it" and understood that it was just RHEL without the trademarked artwork, they helped me. Special mention for OpenNMS who is actually spinning RPM's built on a CentOS box now.