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It depends on what your photography standards are, mine are fairly high and I can tell you that to get a dob to do astrophotography you are going to need to tinker with it alot more than just taking it off the dob mount. Also a 10 inch newt weighs alot and you are going to be looking at a fairly heafty mount to hold it.
I bought an 8 inch newtonian for astrophotography and to get it to work as I wanted it too I needed good collimation tools, a coma corrector, and a new focuser. Now that I am planning on using an off axis guider I need more backfocus so I need to move the mirror up the tube a bit. You would probally need to replace your secondary mirror too being from a visual dob. After all of this, I struggle to bring an eyepiece to focus in essence killing my scope as a visual instrument.
If I were getting into astrophotography as a visual observer, I would buy the dob, do some visual and when I was ready to do some photography buy a small refractor and an EQ mount. The modifications that I have done to my newtonian cost more than an ED80 which is the beginer scope most people I have seen use for photography. Then you have the dob to look at stuff while you are taking photos.
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