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Both scopes are perfect for what you want, and will provide all the challenges you need.
The idea of 80mm & 8" dual mounted is a good move as well, and the ability to interchange for guiding/imaging another great idea. Weight distribution will vary however, and this could cause you some grief.
Also there is no mention of the mount, but bear in mind an 8", plus ED80 will give most small mounts a hard time, so consider that as well.
Best bet is to try it, and also sidle up to someone in your area who is already imaging and see what they are doing.
Gary
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