Any recommendations for aftermarket C-7 power cord for Bluesound Node 2i

Another option to consider is getting a good quality C7 adapter; this gives you lots more choices for the cable.

I just recently sold my full sized DAC for an RME ADI 2 which uses C7 and then started looking for C7 cables and my list pretty much matched what everyone else has mentioned above.   I then questioned myself why I wanted to buy yet another powercord when my Shunyata Alpha Digital cable was now sitting idle so I purchased a  Cryo Treated C7 C14 Adapter from Take Five Audio and am using it with the Shunyata and RME with fine results.

Any thoughts on iFi and SPDIF coaxial cable quality? Is cable quality made irrelevant with the iFi?

@buschmann, the reclocking by the iFi sure helps reduce jitter, but not all SPDIF cables are created equal. 
The design, construction, length all contribute to sonic differences in cables; eg, soundstaging, dynamics, fast attack, etc. I've tried several cables with my CDP and Node2i running through the iPurifier, each was different.

So I guess I'm saying you get many benefits using the iFi by reducing jitter resulting in a smoother, more dynamic sound. So the cable probably is less important. So I went for the cable that sounded the best for my system.

WIREWORLD mini Electra is what I use.

Thanks to lowrider57's comments above, I decided to try out alternative data cables between the Node and my DAC. As I stated above, my original cable was a good quality conventional 75 ohm coaxial cable.

I installed a pretty radical SPDIF cable made by Mad Scientist Audio using carbon fiber for the center conductor. It made a dramatic improvement in the sound. Much more of an improvement than the previously upgraded power cable. The sound was better resolved, bass and treble were extended, and transients were crisper. I'm surprised to find such a change when the iFi is supposed to be regenerating a "perfect" SPDIF signal to the DAC.

I then decided to try an optical cable for something completely different. I installed a Van Den Hul Optocoupler II, and found that at first listen it's a small increment better than the coaxial with carbon fiber and iFi. I'll need a little more listening time before coming to any conclusion.

The Node, streaming Tidal HiFi or High Res files off a USB stick, seems to be capable of really good sound when cables are optimized. It's already my best quality source of music, and it's not fully tweaked yet.