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It entirely depends on the Astrophotography you want to do. Planetary you can get away with a lot of movement in a mount, or even just use the 'Dog' . . oops. . 'Dob' base.
But for long exposure imaging (DSO's) you will definately need RA drive. It will help even more to have RA & Dec drives, and Autoguiding will help even more.
I'd suggest get the 10", then later on save for an EQ6 or better. If it's for Planetary, get the toucam soon and use it in the Dob.
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