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that would be the way to go although you would image through the 8" so you wouldn't need the ED80 if its only for guiding, an ST80 would save a few $ and if you are really keen you could get a guide cam aswell as the achro for about the same price as the ED80.
if you were going to image/observe through the ED80 then ignore what i said about the achro/guider.
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