I have made numerous DIY power cables with a range of connectors. I found that following Chris VenHaus' cable recipes and using at LEAST upper-medium quality connectors resulted in excellent power cables. The one drawback is that the specified Belkin wires are so stiff that the cable is very difficult to use in lengths under 2 or 3 feet. Great value and very good quality, but a problem in a tight space. (I also used DH Labs bulk power cable, and find no difference between it and the Belkin, could be me, just saying.)
I really have no way to judging if cryo treatment of copper wires or connectors produces discernible results (it could be me, it could be "their" claims...), so I don't bother ...but I do use at least "pretty" good quality parts.
It should take you less than 30 minutes to make your first power cable from scratch, maybe 15 minutes for subsequent ones. You can make them as pretty as you want (shrink tubing and tec sheath), or you can switch out cable or connector to see if your ears can tell...
