Which power cord should you buy first

My experiments show a certain amount of system dependency, but all benefited from power amp being fairly high up the list, afterall.  You are taking a fairly small signal and multiplying it with a voltage / current that you want to be as clean as the small signal you are multiplying.  

+1 for Calvinandhobbes.

cable upgrades on my DAC and Power amps provided different forms of improvement.

my DAC needed filtering to remove harshness and clean up the sound. My amps needed a more open current flow.  My power cables did not work well in my DAC and my DAC cable did not work in my power amps.

if I had to do one first think I would do the DAC cable because that ‘took away bad’ whereas the power cables added good, if that makes any sense.

But that’s in my system, with my electric, etc.

I don’t think I included cables in my profile so for reference:

I have a dedicated circuit for my system.

power cables for monoblocks and preamp are custom cables from Triode Labs/finale audio (maker of my amps)

power cables for DAC are Anticables level 3

If you can tell the difference between switching power cords you are truly a remarkable human being.

I upgraded my power cord cause I feel better when I spend money on equipment. It makes me happy to spend money and that’s why I do it.

I have a Power isolator from transparent. That made me feel even better to spend more money and I think this one probably was helpful.

There have been tests done with no big increases in power or sound ...I just used the power cable that came with my amp...

@emergingsoul +1 on "If you can tell the difference between switching power cords you are truly a remarkable human being.” comment

I replace original high end stock cords if I need more flexibility, length adj. etc. Maintenance such as cleaning contacts. tightening screws etc also helps. To keep originality of devices I also buy original manufacturer cable replacement, which always “sounds better” than aged one!