I'd spend the money optimizing your power delivery (e.g. adding a whole house filter/surge suppressor like the Environmental Potentials EP-2050 or a balanced isolation transformer, installing dedicated AC lines with a common ground, making sure your audio circuits are on the same phase and on a separate phase from your refrigerator, installing hospital grade AC outlets, perhaps buying a power conditioner). Lots of things that should be done prior to buying upmarket power cords, interconnects or speaker cables.
Take care of the infrastructure first. It will pay dividends down the road.
Take care of the infrastructure first. It will pay dividends down the road.

