Hello. I've been absent for quite a while, but I'd like to add my thoughts for your consideration.
Not a single R2R/NOS DAC that I have demoed or auditioned in my systems have been what I would call 'laid back' - unless 'laid back' is the opposite of 'sterile and analytical'(?). I have an incredibly difficult time describing what I hear when my either of my NOS DACs are in my systems.
Anyway, I must keep this short because I've got a 2-hour drive ahead of me. I've never knowingly heard a DAC based on the TDA1321, but I have heard a couple older MDHT at an audiophools' G2G, a Denafrips Venus in my system, and my own dB Audiolabs Tranquility SE (1543) DAC, and my SW1X III STD NOS DAC (TDA1541). They all do something better (IMHO) than multibit DACs. They play CD quality music very well. That's what they were designed to do in the first place. Sure, within the R2R/NOS DAC world there are less great sounding and there are fantastic sounding DACs. Combining different chips with different architectures yields different listening experiences.
I listen almost exclusively to CD quality music. I love what my Tranquility and my SW1X III do for my listening experience (and great pleasure!). I realize my SW1X DAC is very different and much more expensive, but a used Tranquility can usually be found for ~$500 to ~$650.
I'd encourage you (Okay, I am encouraging you) to give the Soekris a try. Give it a good 200 hours to burn in. Then, listen to your favorite tracks. Listen to acoustic piano, guitar, cello, voices, harp(!), etc. Decide for yourself if this is the flavor you want. Many people have discovered they really like this sound. I love this sound, so I am very biased in my recommendation. If you don't care for the Soekris, there's an excellent chance you'll be able to sell it for close to your purchase price, or can you return it?
I'm out of time, but I'll be back tonight.