Thinking of taking the plunge.

• iPad running Spotify
• 1/8” to RCA connector.

A bit more than $1, but it will get things going.

Are you looking for a streamer that has a built in DAC, or just streaming capability?  I heard the Volumio streamer, but it was feeding a separate DAC, and it sounded quite good.  I was surprised that the streaming device sounded considerably better than the Sonos streamer, with both fed from the same source and both feeding the same DAC.   

There are lots of choices with that budget. No specific recommendations on brands/models, but I suggest for a budget that size you get a separate a DAC and streamer, versus integrated. 

I have a Wadia 26 DAC, no USB port. It is older technology but still sounds good fed by a transport. 2000.00 all in is the most I can afford

A good way to get your feet wet with streaming is with a Bluesound Node 2i. Available for $400 or less used. HI-Res DAC built-in, uses NAD BluOS (which is stable streaming software) and it’s easy to use. You can obviously get a better DAC and/or Streamer later but its a good place to start.