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Hi Chris,
Small guidescope should be sufficient. Having said that, after a lot of tweaking I stopped using Orion's guide scope some time ago scope because of flex. Flex may not necessarily be entirely caused by a guide scope; actually it largely depends on how rigid is you main scope. Installing a larger and heavier guide scope may cause even more flex, so I would certainly stick to a small and light one that is rigidly attached to the main scope. I personally did not like plastic thumb screws in my Orion's guide scope.
Ultimately though, off-axis or on-axis guiding generally yields superior results.
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