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Cooling an SCT is no longer an issue if you use peltiers. Yes they work, I did it and it cools much faster than putting a newt outside. In fact recently at Broken Hill the scope was cooled from 39 degrees on the mirror to 9 degrees in just under 2 hours. That would never happen with conventional cooling. It does void your warrantee though to install the peltiers. Thorough star testing first is necessary and then when this has passed, then start pulling the scope apart. I have a how to on SCP if anyone is interested.
Yes narrower field of view. The f ratio is not ideal for DSO imaging. Although fine work can be done with them anyway. Mirror flop is less of a problem with the celestron range of scopes than those of Meade. In fact I will go as far as to say they are like chalk and cheese. At high mag 14,000mm I get negilible mirror flop and image shift. Could not say the same for my LX200 10" I had.
If you were planning on imaging DSO, perhaps consider a nice refractor instead.
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