Hi Dan,
the biggest SCT by Celestron is the c14 and that weighs 20Kg so your mount should be able to handle it.I think it is f11.Celestron also makes the edge hd series of scopes.These scopes have extra lenses built into the baffle to flatten the field and eradicate coma.I have a celstron c11 edge HD and apparently you can do deep space objects with it without a focal reducer. There is a description on Celestrons website about the edge HD optics. The edge HD scopes are more expensive than the regular C11 or C14.
As far as the camera goes buy the DMK21 618.It has a much better chip in it than the DMK 21AUS.Look at my Jupiter images from 9-128-2011 and you can see the difference between the DFK,DMK 21 and DMK 21 618 cameras.
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