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Hi Batema,
I assume that both the tubes attach is pretty much the same place due to their similar size, the SW880 Skywatcher has a different attachment system to the BT252 (Bintel) or GS880 (Guan Sheng) Dobs as the Skywatcher has the funky tension handles. Mike Salway has a GS 12 inch DOB tune attached to his EQ6 and I know that AlexN has an 8 inch Skywatcher Dob that he is going to stick on his EQ6 once he gets the tube rings delivered so I dont think there will be any problems for you in the 10 inch zone.
In my opinion, from reading reviews, the Skywatcher 10 inch and 12 inch have better optics and pyrex primary mirrors compared to the Bintel version which does come with a 10:1 micro focuser however. I prefer the 6yr warranty and the look / feel of the Skywatcher dob to the GS/Bintel versions which look a bit agricultural to me.
Either way, you should be able to get this combo (EQ6, SW880 and ED80 pro) with rings and perhaps some extra fruit like eyepieces or barlow etc. for $3000 if you haggle. Certainly the list prices from Star Optics bring them in for only $2700 so its a very good start! Check here on IIS on what else you may need like dovetail bars for the piggyback of the ED80 etc. A webcam like the Philips SPC900NC modded for long exposure will cost you about $285 modded also, and this is a good start to astrophotography as well.
Cheers
Chris
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