Its all relative to the type of niche site you are promoting.
I could tell that the
http://www.pluginfeeds.com stuff from TopBucks especially their gay content would rock your members worlds but, if you only have straight sites and are looking for ebony orientated feeds that will be of no use to you.
In order to make a solid unbiased reply to your question you need to tell us more information, specifically, for what niche and also what type of plug-in content you are looking for.
Regards,
Lee