IMHO it is all system dependent. First is the components for your front end both vinyl and digital. Then the amplification.
You can spend lots or little. The thing to do is borrow the cables and try them in your system. Change only one cord at a time so that the changes will apply to one one component at a time.
The amount of money you spend is a matter of personal budget.
Did a shoot out of various power cords. All of the power cords were plugged into the Audience ar12, 20 amp version.
The power cords tested were Shunyata, Aural Symphonics, Nordost, Synergistics and Audience. See my posts on my System threads.
The testing was done over a three day period and all cables were burned in.
By changing PCs on the Audio Research CD7 I could get more resolution and better dynamics.
I had several friends over for the final day of testing. All were disbelievers of being able hear any differences between power cords.
As the evening progressed they all became firm believers that the last five feet can make a profound difference on the music.
In my system the Aural Symphonics worked best or had the best synergy. It was not the most expensive of the PCs demoed.
So go and try different cables and see what works for you.
That my two cents worth.
