DAC UPGRADE QUESTION

I currently have the following system:

1. Martin Logan 11A impressions hybrid-subwoofer with electrostatic panels.

2. Conrad Johnson Classic 62 power amp-60 watts per channel (not the SE )

3. Chord Qtest DAC

4. Lumin U2 mini streamer

Adding the Lumin and streaming with Qobuz has improved the sound immensely from my Cary CD player being used as a transport and the Qtest DAC.

The Qtest Dac was around $2000.00. 

Looking for upgrade suggestions as thinking I can improve my sound further with a better sounding DAC.

Thank you.