Streamer/DAC Recommendations w Wavelett II

Hello, looking to replace my MAC mini with dedicated streamer, would appreciate your advice selecting a high end streamer / dac.

My current system:

Legacy Audio Focus XDs Active (love these speakers) will add another amp for mids and treble in the future. 

Wavelet II (Great match with the speakers and I will not be replacing as I really like the DSP,  EQ and remote control features) “I’m told the built in DAC is quite good but I have not had a chance to compare”

MAC Mini with Roon using Tidal and Qobuz connected via USB. I’m not committed to Roon and would prefer to direct connect with Tidal and future HiFI Spotify when it’s available. I do not need local storage as I only stream. 
 

Budget 5 to 8k, open to second hand. Really like all the reviews around Aurender. I would like the option to have a streamer with DAC built in but only if it’s significantly better than the Wavelet DAC. Again I love the Wavelet features and match with my speakers so will not be removing this. 
 

Ideally hoping someone has the Wavelet II and did a comparison of dedicated Streamer.  / DAC and what your results were?

plan to purchase in the next few months 

Robert