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for guiding, does it really matter.. I've seen people guide with finder scopes, i've seen people guide with 50mm F/11 $40 dick smith specials.. you name it.. If it can focus light to a coherent point on the guide camera sensor, you can guide with it..
Hell, I've even seen people use 300mm camera lenses to guide with (we're talking $50 ebay special lenses, nothing fantastic thats for sure)
For guiding, the overall quality does not REALLY matter.. provided the whole assembly is rigid (especially the focuser) I found with my Orion ST80 I had a lot of movement in the focuser when changing focus direction.. It was really quite annoying.. However once focused, I locked it down tight with both the locking screw, and using a home made metal rod that attached to the focuser tube and the dovetail holding the scope to ensure 0 movement of the guide camera.. Optics quality really does not matter for guiding.
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