I2S cable recommendations

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. 

Thanks!  I’m excited to get it set up!