Best speaker Cable matching Wilson Audio Sasha

Currently using Kimble Kables 8TC to connect the amp to the Sasha speakers. But would like to upgrade to better suit higher end gear. Amp is Plinius SA-Reference, source is Wadia S7i cd player/DAC. Plinius connects to the Wadia by Transparent MusicLink Super interconnects.

What speaker cable would be recommended for my situation? I would prefer to keep the cost under $3,500. Cable length would be 20 feet.