That actually used to be my cable, that Starlight CIEM cable. It's silver-plated copper, flexible, no noticeable micro phonics and very well built. I sold it because I found the SPC altered the sound signature slightly too much for my liking (it thinned out the signature thick SM3 sound) and went with the BTG audio Midnight CIEM cable, which is OFC copper and maintains the sound sig, making the sound a bit more lush and giving the bass some more weight. The polarity is not an issue with either of these cables. The dot on the connectors ( blue for left and red for right ) must be reversed and face inward, just like on the stock cable.
http://btg-audio.webs.com/webstore.htm#!/~/product/category=2609073&id=28132561
Silver-plated copper and silver cables tend to alter the sound sig too much and makes the sound seem unnatural, IMO. I've experimented with a lot of aftermarket cables for my SM3v2 and UM3X and copper is the best fit, especially if you like a full sound. It all comes down to personal preference, the best suggestion is to experiment and see what you like. Hopefully it won't open up another can of worms like it did for me. There were some cables I bought, listened to for awhile and when I went back to the stock cable found I liked that better. Go figure.