I want to find a feed (or several) for my site. There are categories such as Business, Financial, Health etc and each needs its own targetted feed.

I can go to http://www.syndic8.com but there are so many feeds and I don't know which ones are the best to use.

Are there any polls that I can check for the most popular feeds?

Also, is there one rss feed I can use and just tweak the category so I get the same source?