For those that have separate Streamers & DACS

Visit resellers, audition what your research tells you could be options.

Make a shortlist, then...

You have to audition in your own system / environment. If you can't get a home audition, then cross that dealer / brand off your list.

Try with internal and external DAC's.

Try direct into pre-amp.

Take your time, your choice is important to YOU. 

I'm using iFi Zen Streamer USB to Wyred4Sound DAC2v2SE. The iFi Zen was a little kludgey for initial setup but it sounds far better than I expected. At a $399 price point I wasn't expecting much and I'm still pleasantly surprised.

The Zen stream was an interim purchase for me as my previous streamer had died and I needed something quick. I assumed I'd be trading up within a few months of finding my next streamer.

Maybe not though. I'm still really enjoying the heck out of the iFi zen. And I've got a Matrix Audio X-SPDIF 2 on the way to serve as an I2S converter between the USB iFi Zen and the I2S interface on the DAC. 

I’m using, quite successfully a SMSL SD-9 streamer connected to a Musician Pegasus DAC. I’m getting Tidal MQA which the MQA is decoded by the SMSL streamer, and the decoded signal feed to my DAC which doesn’t support MQA. I’m controlling the streamer with BubbleUPNP which supports access to Tidal and Qobuz. The SMSL Streamer only costs 399, and has excellent sound quality. Further downstream is a Wyred4Sound STI-500;integrated amplifier and Magnepan LRS speakers. Overall a great sounding system.

What I find funny is no one asked what DAC you have.  The best solution can vary depending on the DAC and what is the best input.  Many devices use USB.  This may or may not be the best input on your DAC.  

Also, you have not mentioned a budget.  These things range from $600 (Bluesound Node) to $47K (Pink Faun Double Ultras) that I am aware of.  Best I have heard have been Taiko, Pink Faun and Antipodes but they tend to be pricier.   

The point is there are are lots of brilliant solutions.  What DAC do you have?  Do you have a budget in mind?