Suggestions for Giant Killer rca coax digital cable under $500 used

If anyone can give some advise on nice cable to go from Auralic G2 streamer to Pontus. Audio Hungary a50i to Joseph Audio Pulsar, Reference 3a towers. Using Acoustic Zen Silver ref 2 between dac and amp, Audience au24 se, TG Audio silver speaker wire.
 

Currently using a JPS Labs superconductors 2, 75 ohm coax. Any help would be appreciated.

I just put together this all streaming system ( new to streaming) a year or so ago and wondering if the JPS Labs may be holding something back.