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Having gone through the same process as you I went for the QSI and it have had no regrets. I think the QSI has the closest distance from the chip to the filterwheel - although I'd check to see if the specs have changed. This meant I could save some money and use 1.25" filters with minimal vignetting.
You will need a separate guide camera - I use the dmk41 from my solar imaging setup, and if you haven't already, make sure you've factored in the cost of filters.
Cheers
Andrew
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