Definitely Denafrips Ares II 12th. Nothing I have owned comes close. I have had Schiit Bifrost 2, NuPrime DAC9-SE, Parasound ZDAC V2. The Denafrips has a sense of realism and a 3D like soundstage unlike no other DAC I have heard. Not taking anything at all away from the other DAC's it's just the Denafrips is that good. The Bifrost is also an excellent DAC, but for me, in my system the Denafrips (same price point) is a step above. You can get this unit brand new through Vinshine Audio for around $900 US. Their shipping is super fast (I received mine in less than 1 week) and their customer service is excellent!
Best of luck!