Glad you isolated the difference the room can make. It can transform the sound of any system, typically at a lower expense (and significantly less risk) than new electronic gear. Good acoustics will allow you to accurately assess your system and adjust it to your listening preferences.
To your original question, I settled in on the Asthetix Romulus Eclipse CD/DAC unit. Being a tube hybrid, I was able adjust the top-end harshness of digital to my smoother "analog" preference by rolling the tubes to NOS Telefunken and Amperex Bugle Boy, and I found the process to be fun and educational.
FWIW, my streamer source is a Lumin U-1 and interconnects are Synergistic USB and Transparent XLR,
Good luck.