Cables are the worst bang for buck in the system. If you feel the need to spend much more money, you would do much better to upgrade a component.
That said, cables do sound subtley different. Since you already have cabling that works, I suggest that you try before you buy. Make every new cable prove itself. If the difference isn’t clearly audible, then put the money into a fund for a component upgrade.
Or, DIY. You can get perfectly acceptable RCA connectors made by Switchcarft from Digikey for $5 or so, which are reasonably close to WBT or ETI at several times the price. You can also buy very good cabling from Mogami or Canare, professional microphone cable, for $1 a foot. The sheilding on both of these is excellent, and is necessary if you live in a microwave-rich environment.
The only exotics I use are cartrdige-to-phono. The rest are Canare Starquad microphone cable with ETI RCA’s, which serves an ESL system with a higher end Koetsu as source.
IMO. YMMV.