Upgraded power cables- Who's on First?

I think because they demand the most power, that the amps should get the best power cords.
But then I also feel that the end(speakers)of the system is where I would start to place my priorities and work backwards.
Linn be damned.

The best case is the same quality power cords to every component.
The full loom approach which is one Brit mantra that I believe in.