RSS aggregator

Hi, I am looking for an RSS reader that will download the actual body of the treads, just like a newsreader, and store them on my computer, so I can search them later. It's to keep track of a support forum, they will export RSS. They purge their forums after 3 month, since I use their software, I want to keep the info. -- Thanks http://www.911networks.com When the network has to work