What you seek is a DAC within a line stage....and at $1000-1500 used? You ask for a lot at this price range. Perhaps your best bet would be to hunt down a HT preamp/processor like the B&K 30 and just use its 2-channel capabilities. I personally feel you would do much better to get a separate DAC (so many good ones out there for less than $500) and go with your favorite McCormmack line stage.
John
John