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Definitely go with the 12", and start with prime focus. The image scale won't be huge, but it's a good start to make sure your tracking is working well.
Once you've had some experience capturing a few avi's, stick in a 2x barlow, 2.5x powermate, 3x barlow, 4x barlow or whatever you've got for increased image scale.
Processing is a whole other story.. read my articles for a bit of help on that and then ask questions!
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