Second what Ken says.
GSO, Skywatcher, Saxon and Bintel (Which are rebadged GSOs) scopes are all pretty much equivalent as far as performance goes. After all theres only so much innovation one can have with a Dob in the 8-10" range!
Factors that come into it are the price, delivery costs and what accessories come with the scope. Some scope will come with a large number of eyepieces (my 12" came with 5!) Just remember that the small focal length ones under 10mm will probably be next to useless.
Malcolm
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