Moving up from an Oppo 205

I own a PS Audio DSD and a DSD Junior. I also own a Chord Qutest as well. I am quite happy listening to any one of the three. When Listening to the Qutest I feel like it can't get any better. Then I switch to the DSD and find that it is in fact, better, more involving. And the DSD Jr. is as well. If you have self control, something I obviously don't possess, I'd say find a clean DSD Jr., upgrade it's firmware to the new Windom, and enjoy it.

I also have an Oppo 105 and a 205 so I m familiar with their sound. I have never heard a Mytek....

I would first look at which USB cable you're using. WireWorld series 8 was a big improvement for me in my 105

I was in the SAME position as you with my own- last batch mfg Oppo 205.
I loved the DAC in the Oppo but wanted more streaming features for 2 channel use. I also wanted to cut the cord needing a TV to see whats going on visually during playback. I ended up selling it (quickly) and getting the  MHDT Labs Orchid DAC for those days I seek the tube NOS flavor and then pitched in a few extra bucks and bought a factory reconditioned Cary DMS-500 which had every possible option for streaming as well as a myriad of up-scaling choices thru its True Bit feature - perfect for days I am in the mood for the other end of the spectrum and I want to go all in on the DSD up sampling rate thing. I love both!

ifi pro idsd or chord qutest, border patrol has an amazing sound but is the farthest from mqa...don’t go for mytek they fall short in most sound comparisons.
whatever you buy ,if it’s mqa make sure the firmware is upgradable like ps or ifi because mqa has many types from 16 44 to 24 384 or maybe more and it’s evolving .try to find something with a linear power supply or  upgradable to one.
chord are great but say that mqa for them is downgrading. ps audio make the dac separate than the mqa filter because they claim it compromises their design so only the streamer deals with mqa . if you find something that plays mqa (and upgradable)and has a tube output stage i think that’s the best way to go because tubes can be the cure for digital sound and you can roll nice nos. iv’e just started tidal and my old nuforce is only 24*96 but even now playing mqa sounds better.i’m on a tight budget so went for a used ifi idac2 that’s upgradable to mqa(250 on ebay).

I own a Oppo 205 and the 95. 
toddalin, (open for offers on the 95). 

I modified the 205 with a linear power supply. The 4K video quality with discs and/or a HRZ Firestick streaming 4K Netflix is fantastic!

For audio though I use a PS Audio Direct Stream dac with the Windom firmware. It just sounds better.

ozzy