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Frank,
Given the focal lengths you're talking about...worst case a C14 @ F/11 delivering 3910mm F/L...you'll want to be guiding on the same optical axis as the imaging camera. Whether that be in the form of a guide chip on camera (SBIG) or via an OAG is up to you. An OAG will alter your imaging train and as such the F/L. Guide star selection will need to be considered with both solutions. Its not really a issue, but you'll need to plan framing/composition. If you're happy with an OAG, clearly you can choose any CCD camera manufacturer.
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