What change or improvement are you looking for? For what it is worth I had the same monster cables and when I switched to the Audioquest King Cobra's there was quite a difference (for the better). A little more forward all around. Better bass mids and highs. Then I upgraded to the Fusion Audio Interlocker II's. Again forward - more from top to bottom and a larger sound stage than the King Cobra's.
Also as stated start with the front pair first. Decide from there if its worth it.
Also as stated start with the front pair first. Decide from there if its worth it.