Depends on your need. For best possible performance / matching, I would buget up to $500 each for pair of speaker cables, and $500 for each pair of interconnects.
Your opinion on cable spending
I will be looking to replace my current interconnects & speaker cable within the next couple of months. I can budget up to $2500 for i/c's & speaker cable, my question is do I spend more on i/c's? Or spend more on speaker wire or budget around 50% for both? Your opinion & why would be appreciated.