The ETX 90 looks nice but you'd wind up being disappointed with it in a light polluted area. The ETX 90 is a small telescope at 3.5 inch aperture, it's also f/14 or something close to that which means lot's of very dim objects if you can see them at all. It's really a computerised GOTO spotting scope!
I'd still recommend you go for an 8" or 10" Dobsonian given your budget. You will see alot with 8" or 10" of aperture, so much more than you could even compare with a 3.5" scope.
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