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Matt,
on the 9.25 the 5x needs really good seeing to use it. Still on really good nights the 5x will make mars the size of a 50 cent piece. Jupiter of course is the size of a grape fruit. No accounting for shear focal length in this regard. A powermate and and SCT work well on still nights. Like methanol and a fully worked 6. Can't be beat at times like this. ( sorry ranting - listening to Nirvana)
I most commonly use the 2.5 with both scopes being f 10. This makes Mars about the size of a ten cent piece and Jupiter about a 50mm globe. Definition is good and you don't get too much loss of definition with the toucam. When and if I go the path of the monochrome camera a 5x will achieve better results.
So I would say get the 2.5x for now, it will get the most use in an SCT. Even the 4 times will punch the image up quite large. Pity they don't make a 3x in the Powermate. I would buy it in a snap.
Best of luck.
Paul
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