Need to get off of bluetooth.... looking for a wifi streamer for my budget

No one supports Apple Music.  You can AirPlay it into a compatible device or you can use Apple Music from an android device and use Google Chromecast.  AirPlay sounds better than Bluetooth and Chromecast is better yet.

   Another option with Apple Music is to buy an Apple TV device and a monitor..  If you pick music from your mobile device and play it, then it will show up on AppleTV in the library and it will play at full resolution.  If you merely navigate to the music on the Apple TV without first selecting it from the mobile OS, then you are limited to AAC, Apple’s version of MP3’s.

  My advice would be to get a Wiim Streamer.  Use the MacDac as another poster suggested.  Try AirPlay with Apple on the Wiim (if you have an Android device then try Chromecast).  I would also try a free trial with Qobuz which plays natively on Wiim and virtually every other streamer.  Do some comparisons and then decide.

  A Wiim streamer and a yearly Qobuz subscription should easily fit your budget.  For that matter so would the AppleTV and monitor route.

Cambridge Audio CXN100?  that's what I have. Seems good to me.  $1000.  Anyone have thoughts on this?  Most people here know more than I do!

I did a little searching and it looks like there is a way to import your Apple playlists into Qobuz:

a one month subscription to Soundiiz

I would get a streaming device without a built in DAC and use the DAC in your McIntosh.  Then down the road you start trying other DACs.  I've used the devices from Small Green Computer (Sonore) but they are not cheap.  https://www.sonore.us/ultraRendu.html  ($899 without power supply)

With $500, the "best" option is a Cambridge Audio MXN10, it should fit all your requirements. 

I took all my Apple Music, put it on an external disk, plugged that into my streamer. 

For sound quality, you need Tidal, or Qobuz, playing direct on the streamer. It's a game changer from BT, and other services. It's like going to HD TV, once you start watching it, you can't go back. 

I use my tried and true iFi Zen Stream into my McIntosh C2800 with the DA2 integrated DAC.  I think it sounds great and it’s an inexpensive way to try streaming.  I’ve never had any issues with my Zen Stream but it may be a little less user friendly than others.  I’m looking to try another streamer soon just to experiment but the Zen Stream is quite good.

edit:  I'm using Tidal Direct for my streaming service