DAC for second system

Putting together an office audio system; with space constraints ( not to mention cost).

Looking at R2R  NOS DACS; for an organic sounding system.

There are many threads on Border Patrol, MHDT, Lab 12 etc.  I see there is an upgraded ( as compared to earlier threads) Border Patrol SE-1.

Any listening perspectives on the upgraded model.

Any suggestions in the 2-3 K price point ( up to 5 if its really good ).

Thanks