Power cable

Totally depends on what sound characteristics or improvements you’re looking for. 

Zavfino Prima MKII: https://zavfinousa.com/collections/power-cables/products/prima-occ-ac-power-cable

DH Labs Corona AC is my favorite for under $3K, and it “only” costs $950 for 5’. I’ve preferred it over the $2500 Shunyata NR series.

Incredible proprietary shielding and counter-spiraled 10awg silver-coated oxygen-free copper conductors for noise rejection and increased slam and dynamics.

https://silversonic.com/products/power-cables/corona/

Not much has been published on it, but it is a significant step above their Red Wave cable, and DH Labs offers a 60-day satisfaction guarantee with this cable. 

Used Audioquest Tornado High-Current. Low noise floor and neutral. 
Used Audience AU24se HP if you want a bit warmer sound. 
Acoustic Zen Krakatoa is also decent slightly on the warmer side of neutral but a good overall power cord. 

Zavfino recommended above is probably a solid choice as it gets good rep although I never tried it. I use and like their Arcadia interconnects. 

Don’t spend $1k on a power cable.