I biwired my system using Canare wire from BJC. Holy hell, it does make a difference. Ok maybe not a big holy hell, like going from Bose to Polk, but nonetheless Holy Hell.
My Rti8s are performing noticeably cleaner highs. Before the bass slightly muddied the treble, but now the bass seems to support the treble more than ever before.
Not a crazy improvement, but definately brought a wry smile to my face.