Paradisea for $250?? That would be a heck of a deal, new is about $600, with older models used for maybe $350. It is a good NOS DAC, but if you're looking at ones like the Benchmark or Bel Canto DAC3 (two would be cheaper) then the Apogee is a better suggestion. The Monarch is also a good choice.
You could try the Airport Express if you're happy with your soundcard(?), though it's certainly nothing to get excited about.
You could try the Airport Express if you're happy with your soundcard(?), though it's certainly nothing to get excited about.