Hi Ben,
You will not often get your scope to mags beyond 300X but certainly it is sometimes possible. I occasionally get to push my scope to 600X. Bigger dobs do have better resolving power - I can't remember the formula but I think the increase is directly proportional to the aperture. It does make a difference for resolving detail on Jupiter and Mars in my experience.
The biggest impact is however collecting light for DSOs.Going from 6" to 10-12" will make a big difference to your observing.
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