What is an excellent power cable?

Tributaries 

Easy choice.
Signal Cable.
Well constructed, the biggest bang for the money. I bought 2 for Adcom GFA5802 and GFA5500. It was shipped so fast. I received it before Hurricane Irma hit us in Hollywood, Fl.
As an Electrical Engineer, who works for Power Generation, Distribution and Transmission multinational corporation, I appreciate excellent work and materials, Signal Cable is it. 

I really wonder.... If those who claimed to have bad experiences with the Pangea cables have a vested interest elsewhere.  I never heard any of the negatives that some here are claiming.  If they were genuinely bad experiences? Its still no reason not to try them. It may be a fluke thing. They are well made and sell for a much better price than those ones others approve of.  They are constructed with Cardas cable and litz.  I think I may smell a rat... But, one never knows.

Shunyata venom for sure 
u can buy 3 for $500 
I replace much more expensive cord with venom and never looked back.

A good power cable needs to have solid construction, fit tightly in the wall outlet, and have good insulation. By the budget you say you have, I'm sure all your equipment came with this kind. You are going to hear the usual mambo jumbo of exotic cables that can transfer power in ways not known to physical laws. If we believe all that crap we'll need to change all the power lines from the power station, to our houses to begin with, since they are made of aluminum steel reinforced. Safe the money for speakers, amplification, wine or music.