Just came across this post and wondered what it was you wanted to image. As the 7" MAK have fallen in price and aren't on your list I presume planets aren't your thing.
I'm using a 9.25 Carbon Fibre Celestron and it's a pleaser as an all round scope. But I'd guess in your budget you need to include electronic motor focuser (you probably don't need a temperature compensating one with a CF OTA) and the JMI or Shoestring USB Focuser adapters. Do you also have filters and camera's selected. If you have the main imaging CCD selected, what's its pixel size - as that has a bearing on your ideal scope too doesn't it?
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