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I've had very good results with the QHY5L-2. A little more than half the price of the lodestar but sensitive enough with an OAG and way more sensitive than the QHY5.
Price was the factor for me. If that's not an issue, I think the lodestar is a popular and reliable choice. Not familiar with the rest.
I wouldn't think of the Orion SSAG or QHY5. the QHY5 worked fine for me with the ST80 and a finder guider, but was blank with the OAG.
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