Speakers cost $1000, single run non-biwire no more than $2000, double biwire, single run cable x2 - $4000.
WOW, that shoots the old 10% rule, not just out the window, but into the stratosphere.
Thats your opinion, and its OK, but given a $5000 budget, I think it makes more sense to spend $4000 on the speakers and a $1000 on the cables.
With the Reference 3As, it seems like the best synergy would be to use their cable. I cant help but think that some form of this is used for internal wiring. Using something else would definitely change the character of the sound, which could appeal to you. The only way to know is hear it in your system, but using 3As with their cable makes a good starting point.