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You make the decision more difficult and more expensive if you want to do astrophotography.
An 8" or 10" dob is great for visual observing, cheap aperture, easy to use, easy to transport, great anywhere. But not good for photos.
An 8" or 10" newt on an EQ6 (for example) is a combination of the two. You get the aperture of the 8" or 10", but being on the EQ mount means you can use a webcam to take photos of the planets or moon, or a CCD/DSLR for images of deep sky.
The problem is, an EQ mount is heavy, harder to setup, more expensive, and the eyepiece can get in weird positions for observing. An EQ mount properly aligned with GOTO can give you a database of objects to select from so you don't need to worry about trying to find them yourself.
Frank is correct also, than an 8" SCT might be a good option for you. A good mix of observing and photographic capabilities. Check IceTrade - I think there's some second hand ones for sale now.
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