I own the TG Audio SLVR and Pure Note Sigma. I have used them on subs to power amps with good results. The Pure Note is at lower cost than the TG and is all silver if that matters to you.
www.purenote.com/powercords.htm
www.tweakshop.com/T.G.Audio.html
www.purenote.com/powercords.htm
www.tweakshop.com/T.G.Audio.html