Walkman, I think a lot of us are in the same predicament, in a few months I will no longer have any employees, and my house is on the market. But I can admit that some of my sites that got hit, did "deserve" to get hit. I have invested all I have into replacing what I believe to be all offending content to what Google wants.
If its an algorithm then it should be fine, and eventually adjust accordingly. From there I will feel better, and can use some of the money I get from selling my house to start over again.
Shopping comparison sites are fine I believe, as long as the content they have is unique with information and user reviews. But not stolen content or thin.
Walkman, can you honestly say there are no pages in your site/s that have no copied content or very thin?