If you are looking for something simple to set up and use with USB output then the three top choices divided into two price categories for each company would be the Auralic Aries G1 or G2. the Lumin U1 Mini or U1 and the Innuous Zen Mk III or Zenith Mk III. For each company the first choice is in the $2200 range and the second in the $4500 range. Each is a reputable company with solid software and support. With the rest of your gear avoid these cheaper options unless streaming is just an afterthought.
Music streamer with no DAC and no storage?
I have an all digital Kii Three audio system (active speakers with DACS and amps) controlled by the Kii Controller fed by a KS Realization USB cable from my Mac PowerBook, with Shunyata Denali and Alpha power cords feeding the speakers. I am looking for a top-notch streamer without a DAC (already built in to my speakers) and with no storage needed (I only stream from h-res streaming services in 24/44 - 24/192). I would like to play the streaming services without my Mac computer, but don't need all the functions currently offered in the current all-purpose streamers. Any ideas?