We bring in both individual feeds (national news, entertainment, business, etc...) and send them to individual categories for display on our site - as well as a "top stories" feed. This last feed is a combination of the top stories in each of the other feeds and we use it to feed out Roster Slider. The slider is set to rotate a particular WP category. So you see I need to have an aggregator that will create posts in a category for that Top Stories feed - as well as create the posts to populate the other individual news categories.
I hope I explained that clearly.
Thanks
Daf