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Darren, I think you can probably tell from the above that we all have different tolerances for what we find acceptable at the eyepiece or what appears on the sensor.
Compared to your Esprit (I have one also!), the standard SCT isn’t well corrected once go off-axis i.e. away from the centre. However, there are corrector/reducers that do a better job than the inexpensive Celestron one.
The EdgeHD is good for a full frame sensor, at least the 9.25 and above. I have an EdgeHD 11” which I mostly use for planetary and as a visual scope, but plan to try some “long exposures” soon. FWIW, there are also alternatives to the large and pricey Celestron reducers.
So, for imaging, I’d recommend going for the EdgeHD every day.
I don’t find any major issues with cooling most of the year here in QLD, although in mid-winter we can have 20 degree drops over the course of an evening and nothing short of an open tube copes well with that, but it is manageable.
Of course, this ignores “non-SCT based” options which may suit you equally well…
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