Streamer only

I just bought Cambridge CXN V2 a week ago for $699. So far, so very good. I did not use the internal DAC. I feed it to external RME ADI-2 DAC and into my Schiit Freya+. And into Parasound A21 with Magnepan LRS+  speakers and dual HSU sub.

Nothing to loose starting out using a device you already have. You can compare that to your sound otherwise via say phono and decide from there. I use all WiFi connections personally. Different steaming apps on the same device alone can make a big difference in sound. As can DACs.  The only way to know is to try listen and compare. Cost alone is often not a good indicator of actual performance.

In addition to the budget examples already cited (e.g., RPi, Wiim), there are a bunch of well regarded products that cost between $400 and $1k.  They include the iFi Zen, the Volumio Rivo, Holo Red, Pro-Ject Stream Box S2 Ultra, the Primare Np5, and probably a few others.  I have both an iFi and a Pro-Ject. 

Lumin U1 mini

OP, I tried the Bluesound Node and external LPS with good results. Reliable and easy to use.

Those who have recommended Aurender, Innous, Lumin are ignoring your price constraints. They are double and more your limits.