New DAC! Meitner MA3, Denafrips Terminator Plus, Holo May KTE, Mola Mola Tambaqui

The Yggdrasil is a budget DAC. Upgrading will make a huge improvement in sound. The real question is in which direction do you want to upgrade? Do you want incredible detail? Or detail and musicality. Look at Berkeley and dCS for detail. ARC is detailed and incredibly musical. There are a lot of great DACs on the market today. In general, the greater the investment the greater the performance (of main stream DACs). I would recommend US and European before less expensive DACs. Typically these are great sounding on several dimensions, but miss on a couple. 

Do not consider new interconnect types in your decision. The big deal is the component. AES is likely what you will use… but it is the component that is the determinant of the sound… the best connection is secondary or tertiary.

Thank you ghdprentice.  ARC as in audio research?  I see a lot of references to Chord DAVE as well.  

@chauncey I am considering the Yggdrasil myself and would be interested in your comparisons. I am also looking at the OKTO DAC8 (likely get this one). 

Another DAC that I owned and liked a lot for my 2-channel was the Musetec 005. However, I did not like it as much on my headphones. 

At this point getting a DAC is about synergy. I have an idea of getting a Playback Designs Edelwise or Dream DAC (damn expensive) though I think the 10x cheaper OKTO may be better for my headphones and tube headphone amp.

Synergy is my main criteria now and not really more expensive is better.

The i2s does not mean it can decode DSD (SACD). I do not think that is even allowed with the licensing terms of DSD from Sony. 

My prior Mustec 005 DAC had i2s and that had nothing to do with DSD. i2s is usually a little closer to the DAC convertor (maybe chip, FPGA, etc) over another input such as USB. It could be a shorter path to the DAC's internals.

Why not look at a top end SACD player that now have DAC inputs such as USB. The Esoteric XD lineup, Luxman, Playback Designs, Marantz, etc

SACD is a low priority.  Just seemed like more companies are starting to support i2s so I assumed if you get a DAC with this it's a little more future proofing.