Sorry for your difficulties
What convinced you that it’s not the ISP quality?
My Pro-Ject S2 Ultra runs hot but it’s pretty solid if you can handle USB out. It always snaps up to the network when rebooted.
I have the “Iffy” stream and the sound quality is stunning for its size and price. Not far off from my main system’s Bricasti M5. I have resisted to move onto something else even though it is finicky to connect. I have to reset my Dac and hardware selection each time i turn in on to use it. Not a big deal. Mine experiences a little network hiccup on occasion I can’t explain. The Holo Red is on my radar once they are in stock. Good luck!
I’ve also got a Zen Stream and also like its sound quality especially for the price, but I had problems with the Wi-Fi connection and unfortunately found iFi support to be non existent, which is inexcusable to me for a company of this size. It’s a little over your price target, but I’d highly recommend looking at the new Innuos Pulse Mini as it offers some of their latest thinking, their highly-regarded Sense app, and excellent customer service. After my very frustrating experience with iFi I’ve come to the conclusion that some things are just worth paying up for. Just my $0.02 FWIW.