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Depends what you want to view. Light pollution has no impact on planets, only DSO's.
Okay 909AZ3 is the alt/az mount. You could put your present scope on an EQ mount but it would cost at least a few hundred dollars to do so. That would be a non goto, just an RA drive on an EQ2 which are still wobbly. A good goto mount like the HEQ5 pro is about $1200. That wouldn't wobble with your 90mm refractor.
EQ mounts need polar aligning to track accurately. For visual use rough setup would be fine.
My take on big dobs, they are great for DSO's where low power is used. High power for planets, the planet zips through the field pretty fast. I always found this to be annoying unless the bearings are really smooth. For planets I like tracking. DSO's I don't care.
It depends how much money you want to put into it. This hobby can be a bottomless pit if you're not careful.
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