This is my "low cost" imaging setup. The foundation of the setup is the Celestron C6S-GT which is a 6" SCT sitting on a Celestron CG5-GT goto mount. The C6 SCT is my main visual observing scope, but also doubles as my guide scope and a lunar and planetary imaging scope. My primary imaging scope is the AT66ED 66mm APO refractor which is mounted side by side with the C6. The side by side mounting bracket is a Ken's Rings standard duty saddle plate.
My primary imaging camera is a Canon 30D DSLR. My guide camera is a Meade DSI color CCD camera.
The advantage of having a scope with a larger aperture and longer focal length coupled with a smaller APO refractor is added versatility. The SCT can be used as a planetary scope, a visual scope, and a medium length imaging scope as well as a guide scope. The AT66ED can also be used as a guide scope as well as a portable grab and go scope.