Central CMS for network of micro sites.

Hello, I operate 60+ small HTML sites 10-20 pages each. What I need is kind of Central Content management system where I can operate them all, in one place. Also I will obviously need to move all sites to this CMS and integrate them after the job is done. Requirements for the CMS - Keeping the same structure of sites, and the same URL's as it's now (I don't want to create new pages with the same content) - Easy operating (editing pages, adding new pages, etc...) - Very important feuture: Ability to bulk page adding. For instance I am doing an article exchange with my partner network of sites , let's say 60 sites, I need to add 60 articles to my sites, one article for each site. I need an option that would import the articles automaticly and add them and itegrate them in to the sites, including all the appropriate html page updates, like navigation links on all pages, and sitemap update. - Ability to add codes to all sites at once, for instance tracking codes or banners etc... - Some basic SEO options, like Meta Tags by some predefined mask, interlinking between the pages by curtain keywords, and so on... - Backup option for all network. Not very complicated CMS, built to operate micro sites. You are welcome to bid, if you know how to do this efficiantly.