Point of diminishing return for a DAC

I went with Benchmark for accuracy, neutrality and solid engineering, but I'm getting interested in Denafrips for musicality...not sure which models are significantly more musical than Aries2.  Any experience?Thx for Rendu tip.

If you have money to burn, pay over $1,000 for a any new DAC.
Not that SQ won't get better when more $ are thrown its way
but this technology is improving like crazy. 

Once again millercarbon pollutes another thread with his constant shilling of Synergistic Research snake oil.  Please stop!

You can do much better by spending more than $2500 for a dac. $2500 buys you a mid-fi dac. The best dacs are of the FPGA type which costs more and you get upgrades that improve the SQ 1 or 2 times a year for free. Also, the better dacs have Ethernet network connections.
Also, you don’t need a dedicated music server for a number of reasons:
1: you don’t want any kind of server in your audio room
2: you don’t want to use USB to any dac, it is a flawed connection

your Mac mini is fine running Roon, just place the server in a different room and connect to your dac by Ethernet, keep it simple and provides the best SQ

I would second the suggestion with a streamer and a DAC. Mine are 1:1 at around 1.000 €. 
In terms of diminishing returns it is worth noting that many more expensive DAC are based on another technology. Many DAC’s around less than 2K are chip-based, whilst some more expensive are FPGA-based, which means upgradeable. So it is not just about SQ, but also Lifecycle cost.