Hi Duncan,
I can only speak from my own experience, and that is: get the 12" and get the G-Star later.
1. You'll get experience using the 12" while waiting to get the G-Star.
2. The 12" will give better light collection making imaging better.
3. The 12" will give better light collection making imaging better.
4. See above answers.
I used my 12" for quite a long time and got to know it well before I got into imaging with it. Had I rushed into imaging straight away I wouldn't know my scope as well, and I believe my imaging would have suffered from not being used to using it. When I did get into imaging, I was ready to take that next step.
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