I would doubt there is a comprehensive list anywhere.
You have the big well established, the middle of the pack and small fries. I would bet from what I have seen in the past year or two, there has to be at least a few dozen now competing in the adult space on some level (shared, seo, vps, dedicated).
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Enough Said. 
"Would you rather live like a king for a year or like a prince forever?"
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