What is your favorite budget streamer?

Node Nano, assuming you do not need to bring the big guns out as per your post, se we are going for convenience, price, and functionality.  Bluesound has the best software in the business, which is why it is so damn popular, you can stream everything to it.  I stream Amazon Music, SiriusXM, and Spotify to mine and a lot of background music from SiriusXM for me.  See link here:  Bluesound music services

The Ifi streamer. I have everything from the Node N100 to an Esoteric NO5, and for the price it’s amazing.

I have a WiiM Pro  - Schiit Bifrost (fully upgraded) - NAD D3020 VII - Tekton Lore for my bedroom set up. The Bifrost was a real upgrade for the system.

The WiiM streamer works flawlessly streaming Tidal through Tidal Connect.

I have 1 Bluesound vault purchased in July, 2018 and 4 Bluesound streamers purchased shortly after, and all have worked flawlessly. 

In your $350 price range, I'd order both, the Bluesound Node 130 which as @coronado2 said, is on "special" now for $349 since it will soon be discontinued for the three new models of "Nodes" they have come out with, AND the Wiim Ultra. Test them out within the return period at Amazon and see which one (if either) is demonstrably better sounding to you in your setup.