1. Whatever streamer you may chose, first improve the network. As a minimum, install a decent audio switch such as SOtM SNH-10g (best with full upgrades) and an external power supply such as SOTM SPS 1000 or Ferrum Hypsos. If possible, enter it through fiber and SFPs from Finisar. This will be a huge improvement for whatever streamer you choose. Better than these, just get the Melco S10 (not S100).
2. What is your preferred input to work with your DAC? If you like USB, I have found nothing better than Melco N10. Most Innuos and other brands are OK, but their USBs are noisy and need external reclocking. People will tell you they are happy with the USB from other manufacturers, because they have not heard better. Using DDC brings benefits but is yet another way to fix a problem you should not have in the first place. The Melco does not need extra crap, their implementation of the USB port is superb, the best I have heard. If you would rather use AES/EBU or even better, I2S, then the best are Grim Audio or Antipodes Oladra.
3. Which one to choose depends also on the rest of your system for sound matching and the type of sound you like. For thorough reviews please go to Hi Fi Advice and check their music server reviews for Grim and Antipodes. For something better than these two you would need to spend more than $60K and get diminished results from brands such as Wadax.
Hope this helps, it comes from a lot of personal experience and research. I do small private reviews and A/B comparisons for friends, one is a high end audio shop owner with plenty trade ins, the other is a high end distributor. I enjoy testing as part of my hobby.