The Blusound node can be bought for a couple hundred on the used market. The app is the best. I don't think there is a better low cost solution. I don't know if $600 elevates you much.
Digital Advice
Looking to replace my Denon 2900 which is very old and having more problems.
Option #1DAC and Mac (I already own)
Option #2 Stand-alone Streamer DAC
For digital I play CD’s to the 2900.
Many but not all my CDs have been ripped to the Mac.
Goal is to stream music to HIFI system & play legacy CDs.
I stream Amazon Music HD, on my Mac and mobile devices.
My budget is $600.