Flexible power cable

Pure Note Sigma. I can bend it almost 90* and up against the wall (no damage). Excellent sonics too.

The Omega Mikro and MappleShade are the most flexible ( used the copper foil technology.) but not sure how safe it is ( also $$$ )

silent source high current power cord

ANY power Cord that's flexible is very very likely to be made of multistranded wire which is a poor choice for any audio application due to increased EMI in a multistranded wire. The best designs are those that use solid core wires but that means they are going to be less flexible. However, they sound far better than ANY multistranded cable! So if you are looking for how a cable "feels" then try the flexible , multistranded (ultimately much cheaper wire), designs. But if good sound is what you are looking after then consider solid- corte wire cables

Rmzidann,
You just totally ignore the fact that "foil technology" does exist. From Allen Wright's "Super cable" cook book, the foil technogy is his believe as the ultimate cable design. Both Omega Mikro and MappleShade use similar method to manufacture their cable. As mentioned, they're the most flexible but "fragile".