Thanks for the advice guys
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I might make it a two stage process. I have a 6" F8 Achro languishing. Maybe a GOTO would breathe some new life into it. I also have a 5.5" Schmidt camera which I would like to resurrect. I might do a years worth of work with it on an HEQ5 pro , using autoguiding and shooting slide film and then scan them in to photoshop.
I'm sure in another 18 months there will be even bigger and better things available for the money in the CCD field. And by then I may have decided what instrument to put on it. A lightweight 10" F4 with a conical mirror might still be an option on the HeQ5 with a wind break.