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The Bintel is a re-badged GSO. Main difference is that Bintel (I believe) do assemble the scopes first to make sure all is OK while Andrews (who sell GSO) basically just ship them in the boxes they arrive in.
I had a 12" GSO and it was fine. Skywatcher generally have a slightly better build quality than GSO from what I have seen but with no appreciable difference in the optical quality.
My main advice is don't spend all you money on the scope. You will need a few other bits and pieces, eg collimation tools, charts, red light, etc.
With deciding on 10" versus 8", apart from budget, the other consideration is how big these are and how easy for you to move or transport. Many people are often surprised at how large an 8" dob is, let alone a 10' or 12"!!
Malcolm
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