I use a Peachtree Audio DAC-iT to link my computer and Bottlehead amps up. They pair very well, the DAC-iT has incredibly high decoding and converting accuracy, and flows very well into my amps (Quickie and S.E.X.). It has the usual USB, Optical, and Coax inputs which can be switched between with the press of a button. It also looks very sleek (it's a mac mini case pretty much).
They retail for $549 and they're worth every penny!
They retail for $549 and they're worth every penny!