Buying a DAC when you can't try it first


this is a generic "advice please" post.
I'm driving magnepan .7's with a primaluna evo 400 with KT150 tubes.
Most of my music nowadays it tidal streamed via a chromecast audio (CCA) with the optical output going into the DAC of a MusicHall C-DAC (its a CD player with a DAC that can be used by external sources).

I'm planning an upgrade path and leaning toward getting a DAC like the SMSL SU-9 or Cambridge DACMagic Plus and running the CCA optical through the new DAC. But i have no idea if those DAC's or something else at that price is going to improve on the musichall DAC (which some reviews say is a decent DAC).

Or should I ditch the CCA and separate DAC go the streamer route....but I'm worried that tying a streamer and DAC together limits upgrade path. However i am not totally against it. 

I'm just not sure if i even will hear anything measurably better than what I have so thought I'd reach out to you people for your thoughts and experiences. 

....sigh.

mid-fi-crisis
Post removed 
I'm planning an upgrade path and leaning toward getting a DAC like the SMSL SU-9 or Cambridge DACMagic Plus and running the CCA optical through the new DAC.
No.  Just no.  You have a $5000 tube amp.  Time to put the $50 CCA and the $550 CD player night night.  Streamers and DACs matter — a lot.  At the very least get a Bluesound Node 2i streamer and then try either an MHDT Orchid or Audio Mirror Tubadour DAC, both of which can be tried at home.  You’ll be gobsmacked by the improvements and what you’ve been missing.  And while you’re at it, drop Tidal and get Qobuz — it’s cheaper with a better interface and doesn’t make you deal with MQA nonsense.  Best of luck with your upgrade. 

Soix said it all.
You can even start with an Allo USBridge Signature and any Shenzhen DAC.
Apps Audio has free returns and 30 day price match.
Happy hunting.