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I wouldnt worry too much about critical sampling to tell you the truth.. as long as your sampling is better than the average seeing conditions at your location you should be right... Under sampled data is the enemy. Avoid that if possible, over sampling can be a good thing.. especially if your seeing supports it.
I too image at 480mm F/L - With my new camera I achieve 2.23 arc sec per pixel.. I would essentially like to see it down near 1 arcsec per pixel, though I fear that with such a short focal length, this is probably not going to happen...
I would say anything between 0.8 and 3.5 arcsec per pixel is going to be pretty nice at such a short focal length. My previous camera, the Orion SS pro with 7.8um pixels gave me 3.35 arcsec per pixel, and the results I got from that setup were fairly sharp, and and relatively good... This leads me to believe that at the shorter end of the spectrum, the sampling makes less difference than at the longer end...
with my ST10 + 8" RC I got 0.87" per pixel, and the results were very sharp when the seeing was good enough to support it...
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