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Do you have a Celestron 6SE or something of that ilk?
My most used telescope is a 4" refractor, it's far from cheap but the views it throws up are great. I also live under bortle 7 skies and usually limit myself to looking at planets, the moon, double stars and star clusters (mostly open star clusters) because these four objects aren't really affected by light pollution.
A 5" refractor under bortle 3 skies will show more detail in galaxies and go deeper (show fainter things) than a 12" under bortle 7 skies.
So, I'd say it depends on where your interests lie in what you'd like to be observing?
As an overall useful go-to I'd suggest the 10". It'll be a significant step up from the 6" but the components aren't too difficult to move around. Although I haven't done it with a dob but with two different telescopes moving from an 8" to 10" wasn't just simply an increase in 2" of size but a near doubling weight! When go-to gets added it becomes really noticeable. I've had a 16" push-to dob and a 12" go-to dob, and the 16" was easier to transport and move around and took up similar amounts of space.
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