OP
I've never heard a Rega Saturn CD player, but my assumption is it does a great job at playing CDs. Get a high quality DAC, and run the Rega into the DAC.....there are dozens of threads here on good DACs at multiple price points. Denafrips Pontus II 12th or 15th, Denafrips Terminator II, Holo Audio May DAC, Weiss DAC, Musical Fidelity
Soix also made a good recommendation: get a Denafrips Pontus II (12th or 15th), and a Denafrips DDC like the Iris or Hermes.........and you've got a great starting point for $2,400 new as well (this is what I am still using)