Streaming virgin

Nonsense. And False.

I’d stay clear of the headphone outs and Bluetooth as neither of those options are going to sound very good.

Phone outputs can be optimized similar to any other streaming device.

You also have USB out from a phone.

The knee jerk reaction around here is Bluesound. 

If you want to get into steaming on the cheap, without having to use a tablet, phone or laptop, check out the Grace Digital Link Radio. It connects to your dac or integrated amp via a digital coax interconnect and plays through your hifi. It has a nice screen and Is easy to use. It also has the capability to stream Hi-Res audio should you care to do so. The built in apps include both Amazon Music and Pandora, and it has access to over 100,000 Radio stations from all over the world, plus Chromecast built-in and Bluetooth. It also has a remote. $179 cannot be beat. I use one, and to me, it sounds terrific. It will most likely be all I will ever need. I’m a CD, LP, and Cassette kind of guy, but when I’m lazy, I turn to my Grace Radio.
https://gracedigital.com/products/grace-link

Blusound Node 2i: 450-550
Cat 6 or higher cable: 20 on up
HD Streaming service: 8 on up per month.

This will give you full HD playback capability.  The Bluesound ap will work on your phone or laptop.  Many say BS ap is better than the one in more expensive streamers.  I added a DAC.  You can buy several different designs and sound signatures.  You will need an interconnect between Node and DAC.  I use a $40 coax with RCA connecters.

You will notice volume differences with songs.  Use FIXED volume on the Node and adjust volume using your preamp.