Bi-wire speaker cables for ProAc speakers

What good-quality/neutral/transparent bi-wire speaker cables would you recommend for ProAc floorstanding speakers?

BTW, the amp is a Bryston 4B-SST2 stereo power amp.
I had the 2.5's and got good results with Audioquest and MIT. I thought the AQ was a little better.
Have you considered ProAc speaker cables?
I use Goertz copper bi-wire with my Proac Response 2.5. I also heard that the Proac wire is good.
I swapped in NORDOSTs (FREYs in my case) and never looked back.