You have your music library on your computer and you want a streamer to play it over your network, correct?
You have decent options and the best value is going used
Streamers with good sound quality and UI - Auralic Aries G1, Aurender N150, Aurender N10 if you’re lucky (could be closer to $4,000), Innuos. Lumin U2 Mini or U1 are good streamers but UI sucks.