Of the most common digital outs Toslink or Coaxial I prefer Coax performance far more. BTW, 'Benchmark DAC-1'(usd$975)is getting many raves and the company does business direct with 30 day full return policy.I would try the Rotel sans dac till full break-in these are suprisingly decent changers.
Benchmark website
TAS and Stereophile among others have praised the little Benchmark
Benchmark website
TAS and Stereophile among others have praised the little Benchmark