I’ve been in kind of a similar situation relative to price range. Only that I’m looking to upgrade my current streamer. Which sounds great, but tends to be quite glitchy (Pi2 design Mercury). Within that contending field - Volumio Rivo, Lumin U2 Mini, used Aurelic or Aurender etc. But why not Eversolo DMP A6 Masters edition or even the A8? The A8 is a kind of all in one. Not the direction I’d prefer to go, but is supposed to be so good in its components and design to be worth it.
The British Audiophile did some nice comparisons between the A8 and and (I think) Aurelic streamer: