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I’ve read that you’d need to jump at least 2 sizes in aperture to make a worthwhile difference in your observing, so probably 10-12” as suggested by Mel (who certainly appears to have enough scopes to confirm this theory!) If you’re happy manually finding and tracking, then I commend your dedication, but a larger aperture would allow you to hunt smaller/dimmer objects for which a motorised tracking system would be beneficial. Each to their own though - once I upgraded to a Goto system I couldn’t imagine manually tracking ever again. Obviously cost is an issue for a Goto system, and scopes bigger than about 10” can become cumbersome to move about.
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