Which power cords have high resolutions and separation??

Take your pick of any good quality wire.  Need not cost much.   For power amps current delivery is more important.   For line and phono level and digital devices, shielding is a good thing. 

AQ Thunder are very good power cords ,and very nice Copper connectors, retail around $1k perrotta consultants 

give very good service and pretty decent deals especially if you buy more then one item .

Start with a dedicated 20AMP circuit $300), add an audiophile outlet $150 (PS Audio, Cardas, Furutech GTX, Oyaide R1 or SWO), add the power cable of your choice. The dedicated circuit and outlet did more to open up the sound in my system than any cable I tried or use

And, I’d recommend not using a power conditioner on the power cord, sound degrades

anything OCC single Crystal will be the best sounding power cord.