I Can't Understand What I Read. Tell Me What Airplay Streamer/Receiver I Should Get?

Hello, I'm new to audiophile and addle minded to digital.  I am buying Magnepan .7s and a Bryston 4B-ST amp.  I previously had a Yamaha X675 receiver that had Airplay built in to it.  It also had bluetooth.  I used to use Spotify that could play through either bluetooth or Airplay.  I switched to Tidal and I think it only works on Airplay. 

I am going to use a Aune X1S headphone amp that I already owned as the preamp and DAC.  Here's a link to the amp front and back.

http://en.auneaudio.com/index.php?s=Home/Article/detail/id/97.html

 I also want to hook up a SVS 2000 subwoofer.  

I would like to know what I ought to get that will allow me to deliver Tidal from an iPhone to the Aune.  I assume it's an airport express. Is the Aune going to be able to be my preamp with the sub and the Airplay?  I would like to know if that's exactly right and if there are alternatives to the airport that could give me a better quality sound.  The Tidal is supposedly lossless and CD quality.  Would some of that be lost with the airport and is there better?  

Finally, I've spent almost all my budget on the amp and speakers.  I would like to find an AE alternative that sounds great but isn't more expensive than $250-300.

Thanks,
Adam