If it helps the NuTone bathroom fan from HD that is rated at 70cfm and costs $100 is very quiet. Given the size of the room it wouldnt need to run very often so I doubt you'll exceed its duty cycle. I would personally also run a timer inline with the humidistat so you can prevent it from running too often for shorter periods, plus give you the added control when it's allowed to exhaust.
Do you have forced air heating?
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