Congrats on your PMCs, a great and undersung brand.
I'm extremely happy with Acoustic Zen speaker cables on my IB2i, which are tri-wired with Holograms on the woofers and Satori shotgun bi-wires on the mids and tweets. Having experimented with silver, silver-clad copper, and silver plated copper cables on other speakers (though not on PMCs), I've become a big fan of OCC copper, which to me strikes a great balance between fine resolution, extension, and body.
With PMCs, IMO, it's critical to get those brass jumpers out of there and wire each set of posts directly. It makes big difference in transparency. For FB1i, I'd go with shotgunned Satori.
Enjoy!