Tube DAC with i2s input?

@fastricky Ah ok, I see they have a few less expensive DACs.  I'd want black as well so I understand.  Maybe you can find one used and deal with the silver or go with a Lampizator and forget the I2S like soix said.  

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

I would think the price range you are listening, sound quality would be greatly more important than connection type. So between similar priced DACs the sound quality  might vary by say from one to ten and the variation in sound quality  because of it’s connection type might be .5. 

@steakster Thanks for replying, what is your $6k DAC and what did you do to clean up the power and signal? I do have a Niagara power conditioner and as far as signal I primarily listen to CDs on my digital side. 

@ghdprentice I'm concerned with i2s so I can still use a DDC into the DAC. 

Look at a Terminator 15th from Audioman58. About $5500 from him. It will accept your i2s. It R2R and excellent.