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I think the important point about a guide scope is that it is rigidly mounted and has a rigid focuser with no slop.
Roland Christen from Astrophysics also recommends the guide scope rings be attached to the OTA it is going to guide.
When you think about it this would get rid of potential flexure.
I find the Vixen VMC95 great bang for buck as a guide scope. It has a focal length of about 1 metre, is small and light, has mounting holes in the body to screw it on to the main OTA and the focuser has no slop or mirror shift. Its also very cheap.
Greg.
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