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From your post, it indicates to me you have not reached the limits of your 80mm ED as yet. You should be able to see the Cassini division on Saturn with this scope, using a magnification of 120X or so. Perhaps you have not had a mount capable of holding the image steady enough.
Mars is just a big orange ball for the best of our scopes at present so don't worry about that. Have you observed satellite transits of Jupiter? Well within the capability of your scope.
All that aside, if you must make the jump, the 10" goto is the one I would choose here. Will give you all that you want for the least money.
In the meantime, look out for a cheap equatorial mount for your 80mm on the classifieds.
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