Best cable speakers money can buy?

[Vivialet]

I guess noone can name the best cable money can buy, there are simply too many out there.
I have just ordered the Inakustik 4004 Air, this has made the biggest improvement in my system since I bought the first Devialet.
The german magazine Stereoplay stated that it gives a 20% improvement to a 20000€ System, I can really confirm that also in my system.
All other cables I tried are more or less on the same level...