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I haven't had personal experience with the MOAG or MMOAG, but I'll add this...
Rom..
I used to use a C11 for imaging, with a Lumicon 2" Newtonian OAG and had no problems with it what so ever.. Focusing is tricky the first time, but I used a parfocalising ring and once I found good focus on the guider I simply put the ring in the right spot and tightend it up...
I can absolutely, 100% guarantee that you will not run out of backfocus on the C11... Not even if you added 80mm of extension, then the OAG, then adaptive optics, then a filter wheel then the imaging camera. Obviously you would want to watch your imaging train length, as if you decide to move from the SCT to a refractor you may well run out of backfocus quickly. If your intention is to go from the SCT to an RC telescope, then have no fear, most RC's have a ton of backfocus, and practically anything is possible. This is especially true of the GSO RC's. They have about 11" of backfocus...
The MOAG and MMOAG both seem to be great devices, Mark is sure having some difficulty however.. I think unless you are using a really really large sensor, the MMOAG and MOAG might be overkill. The ST8300 sensor is smaller than a standard DSLR, the MOAG and MMOAG are designed for sensors twice as large, like the KAF16803. This is not to say that you can't use one, just that it may be more than you require at the moment, or even any time in the future...
Rom If I were you, before going the whole hog and buying such an expensive OAG, I'd be getting a hold of one of the cheaper units, like the Orion Deluxe OAG.. See if its going to do for you what you want.. see if you like the results before spending up big on an item that may be very difficult to sell if you find its not to your liking..
Personally, I love OAG's.. I do not see myself moving back to a separate guide scope at any stage for any reason...
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