Best DAC for around $2,500 or less

Unless the Oppo Sonica is better than the 205 which I own, the RME ADI-2 fs is superior. It’s not just a different sound, but cleaner, smother, bottom end more extended and controlled... better all around. I have not heard the Sonica so it might be better than the UDP 205, but if the same there’s better for the money.

These previously mention DACs have multiple favorable reviews:
Mytek Brooklyn DAC
Benchmark DAC3
Schiit Yqqdrasil

Also good reviews:
HoloAudio Spring DAV Level 3 "Kitsune Tuned Edition"
ifi Audio Pro iDSD DAC

If you can spend up to $3k:
PrimaLuna EVO 100 Tube DAC

I'm not confident you can find a Denafrips Terminator used for $2.5k, but if you do get one it's also worth purchasing the dsp upgrade card ~$220usd at  https://www.vinshineaudio.com/shop

Yes, you can also shop used - that's where I purchased my Denafrips Terminator. But because audio digital technology is growing/changing rapidly, the newer digital components commonly outperforms the older tech stuff - building on what was learned before.

Another component purchasing strategy is to continue to buy used/try/sell until you find a DAC you like.  This will take time, effort, a little $ (shipping costs, tax..), but may lead you to audio nirvana.  

For stereo output the Sonica and the 205 are identical.  The extra chipset and processing power only come into play with multi-channel playback

Lampizator Amber 3. I have compared it to the Yggy and it's no contest.