I2S cable recommendations

Some people here have said good things about this DH Labs HDMI cable and they make good, high-value cables so you certainly could do worse…
https://silversonic.com/products/digital-cables/hdmi-2-1/

Now, some folks who’ve upgraded to more $$$ HDMI cables for i2S have reported they don’t hear much difference in this particular application.  I’ll just say this — I’ve read that it’s very important to keep an i2S cable as short as possible (preferably 1 foot or less) as i2S was originally designed to be used internally within components and so degrades rapidly with distance.  I started with this sub-$7 6” HDMI cable from Monoprice for just that reason (it was the shortest I could find) and got huge results and have felt no desire to throw more $$$ at it.  You might wanna buy both of these, and if you don’t hear an appreciable difference just return the pricier cable  

https://www.monoprice.com/product?p_id=13578

Hope this helps, and best of luck. 

Thanks!  That's exactly the advice I'm looking for, I just need somewhere to start.  I've read exactly the same thing you did about I2S cable length so I think starting with a $7-6" cable will do the trick for now.

I used I2S to connect my Metrum Acoustics streamer with their DACs and found it interesting that the designer uses an RJ45-type connector rather than the HDMI connector/cable used by Denafrips and most others.  The lack of an I2S standard is a little frustrating but maybe a result of that connection method being used for short internal connections within one component, as discussed by @soix, and not for external connections between two components.  

I have yet to hear a meaningfully discernable difference between properly constructed digital cables, and would suggest getting something well-built, like the recommended DH Labs cable, but spending the big money elsewhere in the system.

Nice DDC BTW!  I think u gonna be way happy with the results.