The Grover Huffman Pharoah power cable fits your bill and, new, it is in your price range. I just get mine and have been very impressed with the soundstage and instrument separation that it brought to my highly resolving system. I have it plugged into an upgraded wall outlet and also into the back of my Coda Continuum #16 amplifier.
Which power cords have high resolutions and separation??
Price to spend around $500-800 used.
Tonality? I don’t mind that as much but around neutral would be preferable.
Thank you all.