Amazon HD is very good, no difference from Tidal or others. Stay away from Spotify. You need a great external DAC you can buy. Denafrips is the best for the money. DAC is probably as important as speakers for streaming. Server Bluesound Node is excellent. No need to spend 5K for server. Node plus good external DAC is a better return for your budget. Good luck.
The State of Streaming Audio
The State of Streaming Audio - Hi-Res Music, Dolby Atmos, Best Streaming Platforms (a panel discussion on YouTube)
The State of Streaming Audio Skip around. Some will like this and some will fall asleep. Minute 28.15 is very useful talking about Soundiiz for transferring palmists.
Great advice about networks!