Paul, If you haven't already visited, go to Pete's astronomy page. He uses an LX90 8 inch with a Sky-Watcher 804AZ3 Achromatic Refractor and ToUcam for a guidescope, pretty well the same equipment you are using. He also uses Guidedog and an EOS 300D.
http://www.users.bigpond.com/lansma/Default.htm