Upgrade Speaker Cables or Interconnects

You could try upgrading through Ebay.
Some bargains to be had.
Easy to post, try out, and move on from if they aren't what you are looking for.

Managed to get speaker cables (RRP $1200 for $95) which I still use.

You forget some things

A listing of mine from 2007:
My main system (Plinius) is totally Merlin. Verdi, Vivaldi interconnects, Scorpion, Tarantula and Black Widow power, with Scorpion speaker cables.
Replaced my Van den Hul which replaced my QED which replaced my Slinkylinks which replaced Kimber PBJ which replaced my USA Stout silver which replaced Dick Smith's finest.