which power cables for w4 sound sx-1000s?

Why not try Wyred's own power cords? They may have great synergy since the folks at W4S seem to be pretty good at voicing their products. Not too expensive and the worst you can do is return them and eat the 15% restocking charge.

Foster_9 ... I make ALL of my own audio cables from finely stranded UPOCC copper, which a cable manufacturer ( family hook-up ) makes to my own specs ... Cheers

Give the Cullen power cords a try. They are sold here on Audiogon. Send an email to Cullen05 and tell him what you want to use them on and have him make you up a pair of power cords. A few friends of mine have purchased these and said there is a lot of bang for the buck. I personally don't own any but I'm happy with what I have.