Boutique DACs

I’m a big fan of older R2R chip based DACs like the AD1862 and AD1865.

LTA Aero DAC has the AD1865 or you can get the Audial S5b with the TDA1541.

You could also hop onto DIYaudio and build one. I’ve got an AD1862 DAC with a tube I/V stage using a NOS GE 6DJ8 and it sounds amazing.

Berkley Audio - they make one thing...DACs.

They are the orginal team of Pacific Microsonics: among other achievements, wrote the original DSP code that realized HDCD encoding and decoding (including the PMD-100 and PDM-200 digital filters).

Another vote for LTA Aero. 

EMM Labs DV2i Integrated D/A Conver

https://emmlabs-meitner.com/products/dv2i?pr_prod_strat=e5_desc&pr_rec_id=6c332fc46&pr_rec_pid=7234469560433&pr_ref_pid=7234467987569&pr_seq=uniform

dCS APEX DAC

https://dcsaudio.com/product/vivaldiapex