Nice speakers and amp! Joseph Audio has a long-standing relationship with Cardas and uses their wire internally in their speakers, so they’d obviously be worth exploring (although I’ve not heard them myself except at JA show demos).
That said, I’m a huge JA fan and believe Acoustic Zen cables offer strengths that would synergize very well with your speakers. You could get a double-barrel shotgun pair of AZ cables new for $2,248 that’d likely sound fantastic with your Perspectives. I’ve been using them for years, and they excel at sounding very neutral and natural with very good tonality and excellent 3D soundstage. Hope this helps, and best of luck in your search.
That said, I’m a huge JA fan and believe Acoustic Zen cables offer strengths that would synergize very well with your speakers. You could get a double-barrel shotgun pair of AZ cables new for $2,248 that’d likely sound fantastic with your Perspectives. I’ve been using them for years, and they excel at sounding very neutral and natural with very good tonality and excellent 3D soundstage. Hope this helps, and best of luck in your search.