Automatic Sitemap Generator for Multibrand Website

Need a sitemap that will help us optimize visibility with search engines--especially Google. We have a multibrand website, with a homepage that launches the visitor to one of three subsites hosted on the same domain. (See [login to view URL]). Don't contact anyone there...it's against the rules, and you won't get in contact with us, anyways. The site is still under development, but the basic structure is in place. We need something that will update dynamically for the sake of the search engines, and then we also need something that will generate a sitemap that is user friendly for our visitors. We use an FAQ database tool that creates lots of static content pages...and we want to make sure that Google can find these pages, as they are rich in relevant content. Please only respond with a bid if you have expert knowledge of how to accomplish our objectives. We can't afford someone who is learning on the job. You must have high positive feedback rankings on GAF in order to be considered. This project needs to be completed by July 2oth--very short timeline.