The Acme Audio Silver Plated / Cryo'd panel mount IEC has always been a positive product.
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I just completed the mod you are considering on my Counterpoint SA-20, with very positive results. The piece I used was from Mouser (mouser.com), part number 161-0707-1, manufactured by Kobiconn, price $0.74. I don't know if this is "the best". It is the identical part used on the First Sound preamp. For more information, you can read my posting "Experience with PAD Dominus power cord", posted in Amps/Preamps