I am using Real Cable Citrine for my DAC, Furutech Roxy for my integrated amp, and Furutech Odeon for my sub.
But for my Furuteh TP80 mains conditioner I use a 1.5m DIY Belden 19364 that costs 25 USD to make (including the plugs) from my local Belden dealer. The Belden is probably the cheapest most palpable upgrade you can make. It is a power cord with very strong characteristics. It adds warmth, lots of body, and healthy amount of bass.
I actually compared it in my system to a significantly more expensive DIY Furutech DPS-4.1 and was very surprised that the Belden actually managed to extract more bass from my system. But just one Belden 19364 is enough in the chain. I actually had a pair made and initially connected another one to my desktop that is connected to my DAC. Overall sound became too thick and highs became rather metallic. So just one is enough.
If you have a local Belden dealer, try to get from them as it would be significantly cheaper. You could purchase a factory finished one from Belden itself on Amazon Japan, but it costs around $135 USD.