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.
You'll be fine. The first thing I did when I had my UPC 200 is change the power cord. I doubt if you will hear a change in the sound. Power cord changes to conditioners are much less pronounced than changes to audio components (esp. digital) themselves.
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