I would start my journey by reviewing the MHDT DACs and the Border Patrol DAC,
they have a great selection actually a little bit under your price range of R2R chip DACs, with options to add tubes to the stage, or balanced ins/outs, etc.
http://www.mhdtlab.com
But these DACs are also sold via LTA: Linear Tube Audio, check their website too:
https://www.lineartubeaudio.com/
and finally: the Border Patrol DAC
http://www.borderpatrol.net
best
they have a great selection actually a little bit under your price range of R2R chip DACs, with options to add tubes to the stage, or balanced ins/outs, etc.
http://www.mhdtlab.com
But these DACs are also sold via LTA: Linear Tube Audio, check their website too:
https://www.lineartubeaudio.com/
and finally: the Border Patrol DAC
http://www.borderpatrol.net
best