I now have 4 supra power cords - two silver, two copper. Have a silver power cord on my CD player, and copper cords on both my DAC and headphone amp. This combo gives me the bottom end from the copper cord and opens the soundstage with a bit more clarity and detail from the silver cord on my CD player.
I think it best you come up with a budget cause I can easily recommend the 6.5-foot Excalibur for $145, but that might be too much for you. Also, not all cables are good on all systems to there's that as well. That said, the Excalibur is a great cable (I have one), though some may consider it a bit too costly.
If that's too much, you might look at cheaper solutions offered by others. I myself used an
AudioQuest Pearl ($40 bucks) for years without issue, but that's before I got "cable conscious". So.... yeah, I have the Excalibur as well and it seems to be doing some good. I say that because my entire setup now consists of new gear so....
Personally, I think some of the asking prices for cables is also just a way provide a false sense of "
this is the best, and why it costs this and why you need it" sales pitch.
In short, don't fall into the trap of spending an excessive amount for a cable.