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I'm not an imager so the answer is 'the biggest good quality dobs you can get for under $5k with Argo Navis and ServoCat'. However, the OP assumes that you have a mount so then the answer is the biggest newt OTA with a quality mirror for <$5k. I'd prefer it to be f/4.8 but I'd settle for f4.5 to f/5.
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