My system has 5 Shunyata diamondback power cords, 1 copperhead power cord and 1 venom power cord. I find the copperhead and diamondback to be a lot of bang for the buck and that is the most I would spend on cords. I am using the Venom for the turntable motor on my VPI turntable, 2 diamondback cords to connect my Shunyata Guardian 2 and guardian 4 to the wall, a diamondback for my preamp and 2 cd players and copperhead for my power amp.
The noise floor lowered dramatically when I started using the Shunyata products and I find their overall quality to be first class. I am not one to buy into paying as much for a power cord as I did for an expensive piece of equipment so these budget products if you will, suit me just fine.
Bob