USB Cable

Move your pc within 3 ft of your DAC

So what is a quality system (very subjective) 

I have the DH Labs Mirage and they replace Supra Excaliber USB  but I could hear zero diffence. I have an Innuos Zenith and Less Loss DAC with a Wyrded 4 Sound ISO USB Recovery in line to my DAC.  No PC in the chain other than a tablet running the Innuos application. 

Ditch the PC and get a good streamer — the PC is killing your sound.  Also, you can run the streamer to a Wi-Fi extender or Mesh node to an outlet near your system and not have to buy a 5m USB cable AND have much better sound.  Upgrading a USB cable from a PC is basically putting lipstick on a pig.  Sorry, but it’s true.