Where do cables upgrades have the most impact?


Assuming all existing cables in a system are atleast mid-grade (not junk), which cables/interconnects should be upgrade first and in what order? Where should one start?
128x1281extreme
Curious if those saying the power cable had the most impact are plugging into a power conditioner or a wall outlet?
For the impact of aftermarket power cables, The wall or conditioner.. Does not matter. Power cords can be effective from/to either. Plus consider the wall AC duplex in this equation. The AC duplex can also have an effect on the sound (specially if aftermarket powercords are used)
Looks likes theres no consensus . Best bet is to buy a cable and try it out on all your components .