What's First, Interconnects or Speaker?

I have mediocre cables currently and will purchase used cables soon, like Acustic Zen Abslute, Nordost Valhalla, or Synergistic Research Precicison. My budget will allow me to buy in stages. Starting with the best performance first, where should I start my purchase in these stages? I figure six plus months between purchases. I have 2 analogued bi-amped amps, 1 Tube pre-amp, plus redbook cd and one turntable. All advise is welcome. To see the Brands, please refer to my other question under the same name, "which cables to purchase".
Thanks, Sargentfriday