If your looking at astro photography a 10" dob when you have modified a few parts preforms extremely well. to the point where you wouldn't be able to pick that its of a low end dob variety unless you looked at it!
The NEQ6-w would be the absolute minimum that you could go for with a 10" even a 8" Newtonian. If you look at Skywatcher they use Pyrex glass which almost negates cool down time due to the low expansion.
If it was me i wouldn't bother with Go-to celestron scopes, sure they buzz around and sure you can see a few things but like it has already been said. What you pay gets divided between aperture and gizmo's. More aperature less gizmo's less aperature more gizmo's.
I myself own a 10" dobsonian that i have modified to work as a astrograph for astro photography
www.brendanmitchell.net/Project%20254
www.photobucket.com/brendanmitchell
Are examples of the 10" dobsonian (and a ED 80) with a Canon 40d. Also with my experience and though looking at people on this forum, if you are a keen photographer you will move away from visual generally in a speedy fashion. Not that you will forget about visual, just the camera holds a lot more.
Though in saying that, don't be fooled, astro photography isn't easy, as compared with the 1/1000th sec shots for day time, your integration time for a DSLR will generally be 10 min each exposure, and you will do that for 8 hrs. But is very satisfying when you get a good shot!
Good luck