OP: I’m looking for better depth/dimension, separation and analog warmth.
I have a tube DAC (MSRP: $12K) and a SS DAC (MSRP: $6K). Both offer depth - dimension - separation. Both sound quite good - just different flavors. Neither are harsh or fatiguing. They’re very musical. Yet years ago, both did sound harsh & fatiguing.
My interpretation of analog warmth is the absence of digital distortion. That is accomplished through cleaning up the signal and the power in the digital chain. The effort is worth it. Good luck!
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Neither has I2S