don't seek input and opinion from the willfully ignorant.
We use a variety of A2D and DAC in the recording studio , Berkely is always on offer as it is generally more detailed and incisive. I would suggest you add the Brinkmann Nyquist II and Aesthetix Pandora - Signature to your audition list. You might also consider Audio Note and Lampizator...both excellent.
As to used units for sale...i would consider that the normal state of the market...
Have fun, enjoy the journey , the music
Jim