For my Woo amp, I used the common Volex powercord. It's cheap but very durable and has good reviews. Plus I believe it's hospital grade-whatever that means.
But now, I use the Signal Cable Magic Power powercord which is designed for high powered amps. I don't know if it actually improved the sound because I have never bothered to do an A/B comparison but it is thick like a garden hose and really built like a tank (sorry for the cliche expression). The exterior was designed to resist abrasion, water and oil. I am confident this cord will last many lifetimes and can probably survive an earthquake and nuclear melt down. The cord is so strong, that it can probably be used as a weapon. Plus it looks so cool. And the price was relatively reasonable at around $70 I think. Signal Cable can also make a European plug termination I think.
However, you can't go wrong with a Volex cord though. It's thicker than those common stock cords and probably pet resistant. I doubt a mouse can chew through it. I now use it for my bedroom amp as it is tough and durable as well. I'm not sure if Volex has European plugs though.
Edited by Spareribs - 5/16/11 at 10:14pm