I know you are in information gathering phase and probably won’t pull the trigger on a streamer until your DAC arrives. While you await, I wanted to reiterate the importance of LAN cables. My experience with fiber optics kit was not great, as they tend to rob the dynamics and make the sound thin and lifeless; they do however effective in lowering the noise. That’s why I remained focused on lowering the noise by way of employing a high quality Ethernet switch / filter and use the best possible LAN cables. I have tinkered with wide variety of LAN cables over the years and found hybrid LAN cables with high purity silver and copper renders well balanced sound.
Knowing your discerning taste in music and gear, I would start off with LAN cable that uses PC-OCC copper and silver, like Audio Sensibility Signature LAN. Reasonably priced under $300. I am thinking of ordering a pair as well for my upcoming experiment with SOtM switch and filters. There are other favorites like Network Acoustics, Sablon, JCAT and SOtM (for crazy money). Supra CAT 8 is a good starter cable but you will end up walking away this once you hear cables from aforementioned brands.