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1) I own a 5" Apo and a 11" SCT. The 11" SCT is far better for planetary imaging. I do planetary imaging at around 7 metres focal length, many others are up over 10 metres focal length.
2) Field rotation over the length of a night is a non issue - the real issue is field rotation in the length of any video clip that you capture to process. For Jupiter, you will be looking at around a 1-2 minute video clip to process to produce a single image. You do not want any noticeable field rotation in the clip. The amount of field rotation, of course, depends on where the planet is located at the time of capture. Low and rising from the East is minimal field rotation, near zenith is alot of field rotation.
3) Yep, light pollution doesn't play a major factor in planetary imaging. Some mounts are more silent than others, but those details can be found by reading product reviews when you have narrowed down your choice.
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