I'm with you on the R2R DAC thing. The Metrum Onyx is another one in your price range and is also NOS. The Onyx features a lot of the design and proprietary technology from their top DACs, and they're built in the Netherlands if that matters. Here's a little more info in case you're interested...
https://www.ebay.com/itm/122898435236?ul_ref=http%253A%252F%252Frover.ebay.com%252Frover%252F1%252F7...
Best of luck in your search.
https://www.ebay.com/itm/122898435236?ul_ref=http%253A%252F%252Frover.ebay.com%252Frover%252F1%252F7...
Best of luck in your search.