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Interesting topic -- I'm tempted (read likely) to get the QSI 690 wsg-8 with built-in OAG for my next CCD (maybe next year...), and have been musing on what sort of a guidecam I should get to fit in the OAG port.
One option is to use my current Orion SS G3 CCD - it is quite sensitive, albeit perhaps a little heavy for an OAG port?. Another is to get a lightweight and sensitive CMOS camera like the QHY-5LII, but I'm not sure if it will be sufficiently sensitive for use in an OAG. Ahhh, decisions.
I currently guide with a NexImage 5 planetary cam using Metaguide and a guidescope - works well enough, but risks issues with flexure etc. at longer exposures.
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