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For doing planetary imaging you only need a motor drive, guiding is used for long exposure deep space imaging.
A good mount makes imaging a lot easier, and with a guided system the whole process becomes more consistent. Start small with a good mount and you will be there in no time. An 80mm apo is a perfect start with something like the HEQ5 pro.
The bigger the tube the more it will be affected by wind and longer focal lengths make the smallest vibration noticeable.
If you do go for a 8" f4 newt you will need a coma corrector as well, an f5 is more forgiving.
I have a simple pier behind my shed, but its a lot more stable than a tripod so I can get away with putting a 10" newt on my HEQ5, anything smaller is fine on the tripod.
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