System to crawl thousands of rss feeds.

Hi, Im in need of a script which crawls rss feeds... I have all the rss urls in a database, i have tryed a program called Magpie RSS - PHP RSS Parser ([login to view URL]) but it cant crawl certain rss url like ( [login to view URL] ). So what does the system need? 1. Should be able to crawl atleast 95% of the url i have in my database, each rss feed is linked to a user id. 2. It should rank rss feeds depending on how often they type new articles, so the crawl script doesnt crawl a rss feed everyday if the writer only types once a month, makes sence?. 3. If it cant crawl a url it should jump over it and try a new one. 4. The script should crawl a maximum of 10 rss feeds each time the script runs. I will set it in cronjobs to run every 5 minutes. 5. Your allowed to use the magpie script if you mod it to work with 95% of the urls. 6. i will send you a txt message with all the urls then its up to you to create a database for it since i cant give you access to a live website. 7. it should crawl (link to the article) (title) (the article (1000 letters max))and the date/time.