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I think you are best off getting the 10 inch collapsible dob to start out with and forget about what may eventuate in the future. The SW dod on Andrews is great value at $700. I think starting AP with a 10" on a EQ6 would be hard work.
The beauty with refractors is that you can get one with a short focal length. This will give you lovely wide views of the sky. An added advantage is that for AP you don't have to have everything spot on to get a good photo. Tracking errors are not so critical. This allows you to learn AP at the same time as generating good photos. I would hate to spend all that money and then give it away due to the frustration of not getting everything working. Although don't expect to have no frustrations with a refractor.....lol
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