$1300-1500 DAC

The Ayre Codex, at $1800 new, is the most musical I've heard under $5k!
It transformed my system from very good hifi, to true audiophile grade. I can't recommend it highly enough. Of course their QX-8 is better at nearly $6k, but the Codex is similar in musical satisfaction. There is a richness and flow to the music which I usually only associate with vinyl.

Oppo 205, DSD/MQA/PCM DAC $1299 MSRP.

@andrewkelley what DAC do you have in your main system? You may be surprised by the Audio-gd R8. 

By the way, I have 3 PS Audio Noise Harvesters. The affect the sound very very little, if its not placebo effect. I dont recomend them. 

A third vote for the RME 

@piga  so I had this humming sound in one of my speakers and I tried everything to get noise out of my line including the PS audio Noise harvester of which I have 3,  they were blinking like crazy .  Anyway time went by and I kept trying one more things to get this noise out of my system then one day when I was cleaning out the garage I unplugged one of those bug zapper lights I went back inside to get something to drink and boom Immediately noticed the noise was gone.  I went and looked at my noise harvesters and they had stopped blinking.  The bug zapper was putting DC noise on the line.  I don’t know if they remove noise but I know they can tell you how crummy your electricity is . 

My main system has a Simaudio Moon 280d