There is a nice article here on Astromart.
http://www.astromart.com/reviews/art...article_id=652
And here is Uncle Rod's guide to used Schmidt Cassegrain Telescopes.
http://skywatch.brainiac.com/used/index.htm
And the best of CN Cats and Casses.
http://www.cloudynights.com/topic/17...f-cats-casses/