Posted By Ed York
I have an 8" Newt on an EQ with dual axis drive. Setting up next to a 10" dob on a couple of occasions, it seemed my view was as good or better then the 10" dob. It could be any number of factors (EP, particular scope, dust on mirror, ....) but it made me think that since mine was tracking and the object not moving in my view, then I could settle in a bit more and the view got better.
Depending on the size issues I would say go with either the 12" Starhopper or the 13" Coulter or sink a little into the C8 to clean it up and possibly get the glass coated. Gut feel, you will not see much difference between the 8" and 10" and you'll spend a few hundred bucks to find this out.