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I am with Niko. I kinda assumed you had committed to the Tak. As John properly pointed out, a small refractor regardless of optical quality is not usually a good choice. Wouldn't be too bad if you have access to really dark skies. For example James O'Meara acheives some great results with 5" and 4" refractors but he does most of his observing at altitude in Hawaii!
For urban use aperure is super important and dobs of at least 8" are usually the best option!
Malcolm
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