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Pete, the 8” packs a fair bit more mirror area over the 6” so there is an appreciable difference between the two...not night and day, but it is noticeable. However, the gains may well be swamped out by the light pollution in the city.
Many revisions of the C8 optical tube will slip straight into the dovetail clamp on your Evolution, so you might save a few $$$ by looking out for a good quality used one.
Cheapest thing I’d suggest is to take your scope out to one of the club gatherings outside of the city. You’ll get more out of any scope that way.
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