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I was also thinking that Atik 383L (or similar) is a very good value for money.
Another option would be to get a hyperstar, which I believe reduces FL to 560mm. Acquiring focus at f/2 would be a true PITA though, but at the same time you could pick from a wider range of suitable cameras (I think Atik 460 would be very good) and a real bonus with hyperstar is short integration time at f/2.
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