I think you are better off with your single 20A line. Less likely to introduce ground loop hum if I am not mistaken. Your draw is not that heavy either.
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Putting in a dedicated line- a 20 amp home run to the breaker box using 10 awg wire was among the top 3 most cost effective things I've ever done to my system. My electrician thought I was nuts on insisting on 10 awg. Total cost including the PS Audio outlet was under $250.
Everything is plugged into the one line. The amp is plugged directly into the wall outlet and then everything else is plugged into a Wiremold strip (which I got from a Naim dealer before it became the rage amongst Naim fans).