Youtube videos that a DAC shouldn't be over $150-$200 seem to be the currently very popular...there are some surprisingly good low cost DAC's out there now (currently using a $129 Schiit Modi+ on desktop), but have found more expensive DAC's from Schiit, PS Audio, Denfrips etc that sound much better...
DAC 'Scam' Vid
https://www.youtube.com/watch?v=7Sg1nYLmLCw
The TL:DW is that any well made Dac should not be more than $200 and anything above that doesn't sound any better since they all use similar cheap chips to do the D/A conversion. Anything above $200 for a DAC is basically snake oil and theres no improvement in sonics.
Appreciate your insights.