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is that Brett's unit you've picked up?
according to CCD calculator (a super handy little program), the M25C will give you an image scale of 1.75 arcsecs per pixel at f9, and 2.5 arcsecs per pixel at f6.3.
You'll likely be seeing limited with both setups, while as Shiraz mentioned when the seeing is better than 2.5 arcsecs per pixel you might not get the same detail at f6.3 as you would at f9. In any case, should be a good combo i think, although be prepared that the fov will be smaller than what you currently enjoy with your full frame DSLR.
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