I have a Primaluna HP integrated, and the Chinook. I put Signal Cables PCs on them. The improvement is subtle at best. They weren't expensive, so I'm keeping them. I did notice a bit more dynamics to the sound, but again, subtle. I'm not convinced it would be much different if I spent $1k or even $10k on a PC. Consider your overall system and the value it will add overall. The Signal Cables were under $100 each.
As others have said, I'd start with the PL and Manley, and if you have a power conditioner, that too. But, I don't see spending multiple hundreds on six feet of wire.
As others have said, I'd start with the PL and Manley, and if you have a power conditioner, that too. But, I don't see spending multiple hundreds on six feet of wire.