More often than not what would seem logically to work best turns out to be beaten hands down by something you cannot explain. Go get a 20 year old Synergistic Research Master Coupler power cord for $175-250 and when you hear how sick it makes everything else you have sound get back to me. I like to DIY, built my turntable, several speakers, interconnects, etc and modded a bunch of stuff. Which is how I know what you can DIY well and what you just can not. Certain things it does make sense. Power cords, speaker cables, interconnects, power conditioners, power strips- forget about it. Unless you really enjoy tinkering. Some guys just love soldering and screwing so much its worth it to them. Just don't kid yourself. Every single one I have made, tried or heard was utterly slayed by what could be bought new or used for far less than your cost of parts. Tired of telling the story of the 30-year DIYer whose masterpiece was crushed by something cheap, old, and random pulled from my used cable drawer. Okay in reality the cable was fine. It was him that was crushed when he heard how awful it was compared to really old cheap crap I had long since discarded.
Wish I could tell you what to get but sadly you just have to try a bunch of stuff out and buy- not make, waste of time and money, but buy- whatever sounds best in your system and to your ears.