Hi Russell. As Mike has said, the biggest problem will be weight. What is the limit for your mount? To achieve a noticeable difference you will probably want to move up to an 8" SCT. That may be too much for your mount.
If you would like to go up in aperture without buying a new mount have you considered a Dob? No goto (unless you get an argo navis) but plenty of aperture for the bucks.
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