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Mick,
This will depend on what Camera and target imaging you will be doing.
Small chip CCD's will need something like an ED80 or even shorter focal length where a large CCD or CMOS chip like a DSLR or dedicated SBIG camera's can be used on larger aperture and longer focal lengths scopes for DSO's.
A small ccd chip is not optimal for a large aperture long focal length scope.
This will also depend on what you want to do regarding widefield or longer focal length imaging.
If you had a camera in mind and what you plan on imaging then we could offer a good match.
There is no such thing saying a particular scope is great for Astrophotography.
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