When I mentioned the $100 credit to Drew at Moon Audio, he said it was unlikely that Hifiman would be offering the credit to customers that pre-ordered through a dealer. But if Hifiman wants to throw a $100 credit my way, I'll definitely use it for something at the Head-Direct store. To me it makes sense that Hifiman would credit customers that preordered directly from them, but I tend to agree with Drew that dealers won't be given the same $100 credit to pass on to their customers.
As for balanced cables, I will be modding my stock HE-560 cable the moment I get it. I will replace the Neutrik 1/4" with a 4 pin mini-XLR that will allow me to use the HE-560 either balanced or single-ended - I have assorted adapters to allow me to use them 1/4" or 1/8" single-ended or Kobiconn (RSA/ALO), dual 3 pin XLR or single 4 pin XLR for balanced. Of course if Hifiman was to issue me a $100 credit, I might just go ahead and order a balanced cable from Head-Direct. :)