What about a used PS Audio Perfect Wave DAC? There are a boatload of them for sale on Audiogon right now. Apparently, owners have a hard time giving them away, which might be all you need to know.
(I actually own the Perfect Wave DAC. It sounds very good with the Perfect Wave Transport, which I think may be the stand out PS Audio digital component. In all honesty, the DAC sounds pretty mediocre from every other digital source -- S/PDIF, AES/EBU, and the PS Audio Bridge. Even with the MK2 upgrade, the DAC doesn't sound that great unless you also own the Transport. And even then, the DAC has a pretty narrow soundstage. In some ways, a cheap Northstar M192 I once owned threw a much more convincing, absorbing soundstage than the Perfect Wave DAC. And the Northstar sold used for about $800.)
(I actually own the Perfect Wave DAC. It sounds very good with the Perfect Wave Transport, which I think may be the stand out PS Audio digital component. In all honesty, the DAC sounds pretty mediocre from every other digital source -- S/PDIF, AES/EBU, and the PS Audio Bridge. Even with the MK2 upgrade, the DAC doesn't sound that great unless you also own the Transport. And even then, the DAC has a pretty narrow soundstage. In some ways, a cheap Northstar M192 I once owned threw a much more convincing, absorbing soundstage than the Perfect Wave DAC. And the Northstar sold used for about $800.)