In my experience overall, power cords or cables, have a relatively minimal role in getting that 3D holographic soundstage you are hoping to achieve. There is no harm in getting good PCs, but you might want to direct your interest and money on/to the best components you can get . As stated above speakers are a critical element in any system. I am old school and think get the speakers you like first and build around them.
You may not want to hear my advice but I am convinced that tubes do the best job with sound stage, especially as the power amp. Good luck on the journey.