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All good advice so far. But don't be afraid to ti higher mag if it seems a good night - if you don't try you won't know. One night at Astroron's it was incredible stable. On Saturn with Ron's 16.5" scope we got to 500x I think before it became a soft. On my 12" Dob, I had a Pentax XW 5mm with a 2.5x powermate giving 750x. My notes say, "Cassini division all the way around, Encke division visible. Some banding visible. 6 moons, Enceladus, Mimas (just) Dione, Tethys, Rhea, Titan visible."
It was an exceptional night though. The image was only a little soft at 750x, but it was quite useful still. I had collimated at the start of the session (SW Flextube so I always check it after travelling), which probably helped quite a bit.
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