Looking for best streamer without DAC under $3500


I currently run Metrum Ambre with Metrum Onyx and really enjoy it, but am looking to upgrade to a better streamer that has spotify among other aps. Currently looking at Lumin U1 mini, Auralic, etc.

Curious what others think
128x128justjames72
Snafujg,
   I’ve got a Terminator as well and like you am curious about the I2S input. Currently running a Roon Nucleus usb and sounds great to me, but curious about I2S. Anyone see an upside to I2S over USB? Also, are dedicated streamers better than my Nucleus?  Not trying to hijack the thread but maybe the Nucleus is a good option for OP.
Not sure about "best", I only know I am using a NUC7i5 with the ROCK operating system (provided for free by Roon) housed in Akasa Newton S7 Fanless case for 7th Generation Intel NUC Boards. It was challenging building, but fun and if you can follow instructions very doable. If it looks too hard then Nucleus (same operating system and uses a NUC) essentially does this for you. I am not looking back (totally satisfied), just a solid utility (just need to turn it on) that works really well; around $600 all in.  https://kb.roonlabs.com/ROCK:_Getting_Started
I use a Linn with ethernet connection.
Great sound, some linn streamers are in your price range.
Why. Not build your own machine for several reasons much higher parts quality 
such as a a Jcat Femto clock usb card, a Jcat net card, SS hard drives 
a external Linear power supply .fanless heatpipe case like Synology or other cases. Mojo Audio build hot rod - best name brand parts  to whatever you require
it could cost up to $4k . Ben at Mojo Audio  knows Digital very well his quality 
and sonics with dacs, and servers is very well known in the industry and have won many show awards. We have dissected several name brand streamers even at $4-5 grand + and average at best parts .I don’t see dual Femto clocks in  other
products at this price or parts quality even close .like Sparkos
Descreet opamps ,Vishay naked resistors.Mojo Audio without question build great Linear power supplies in all their products, no switch mode power supplies. look up Belleson Super regulators ,the best out there .a seperate linesr power supply is critical to get the best sound and isolates the bower supply from the sensitive digital section. Like seperates ,you can put more quality in it.
in my dac alone there is 9 Belleson regulators, very $$ In the powersupply ,plus Mundorf 4 pole capacitors. Made in USA 45 day return policy on mojo design    ,5 year warranty and modular,updatable  .apples to apples ,no dealer mark up,all the money is going into the build. Who else out there  offers this ? Nobody I know of .check them out .