The best I have tried so far are the Z-Cable Cyclone, JPS Labs Kaptivator, and the Harmonix X-DC. The Harmonix was best on my tubed DAC, but not on the SS DAC. The Cyclone is best on a Northstar Extremo DAC, and the Kaptivator best on an Oppo SE player with the digital and analog sections separated, each with their own powercord.
So far, I don't prefer silver wired cords, but I've only heard three out of probably thirty good ones on the market.
We need more people contributing here !