It all depends how much you want to spend.
For $200 you can get a Musical Fidelity V-Link 192 (discounted from $400) at Music Direct.
Stello U3 is quite a bit better, but costs $499. IMO this is the most sensible choice for AN DAC One.
Then there are EA Off Ramp Turbo 5, BADA Alpha USB, Soulution 590 - but those are $$$.
For $200 you can get a Musical Fidelity V-Link 192 (discounted from $400) at Music Direct.
Stello U3 is quite a bit better, but costs $499. IMO this is the most sensible choice for AN DAC One.
Then there are EA Off Ramp Turbo 5, BADA Alpha USB, Soulution 590 - but those are $$$.