bob540,
OFC in the description means "oxygen free copper". As far as "the best copper on the planet", etc, would you advertise the product that not many need and you ask substantial money for as "made of just an average material"?
To put things in the other perspective, I recently, a week or two ago, bought a few "aftermarket" power cords. Stock ones were just fine, but too long. Made a mess behind the equipment. I did try to compare. I am happy that I bought them as they are the right length now, but as far as sound goes, I would recommend you take some kid for ice-cream instead of spending money on power cords. Someone can talk about synergy, this, that, add a few more wise things, but ice-cream is a better deal, no matter how you look at it. It may even earn you a few karma points that power cords will not. Those power cords are from bona fide audio company and they were as cheap as aftermarket cables go, but still more expensive than what I already had.
If you decide to pursue cords, make sure you know in advance when you will stop. There are many "best coppers in the world" vying for your money and each one is more expensive than the previous one.