As long a one as you need... you'll be fine. Be prepared for a slight change in the sound however when changing to a new supply cord for the 200. Every cord has it's own flavor.
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With respect to the other poster, I feel the supply cable to a filter or conditioner is key. The flavor of that cord introduces itself into the rest of the things plugged into the conditioner.
it does/has in all my systems.
All of my power cables, if used as supply cables will change the sound of the various components. If you run that 200 in high current, everything will become smoother and a darker background will result. If you divy things up by switching to the separate mode it'll be a bit more lively, by comparison. this is a minimal difference but definitely noticeable.
I've taken mine out of the audio system completely and use it for PC and peripherals.
See how you care for or don't, the orig cable, and choose from there. Neutral, lively, warmer, smoother... it's hardd for me to say what to use not knowing which way you want to proceed or waht stuff you will be supplying with it.
BTW... you don't really have to spend tons on the supply cord as a rule. it does hwoever infulence everthing downstream of it. No question.
DCCA, VooDoo, VAudio, Grundig, etc. the overall length might be the costly aspect though.