Eltonel, I hope you will not get more confused than before posting your ad
From your distribution panel to your Wattagate outlets I would not spend a fortune in very sophisticated power audio cables. Keep the money to buy them short between your outlets and each component. Mine are MIT Z cords II with 350/330 Wattagate plugs with an excellent quality/price ratio.
Going back to your question, for a long run (50 feet) from your distribution panel to the outlets, especially if you are crossing through fluorescent tube lights, freezers, your tool shop, etc. I strongly recommend you to run a stranded and shielded cable. One of the best (industrial) cables you can find is the Olflex-590CP, specially made for power supply applications, shielded to avoid any EMI. This cable is made in Germany but is UL and CSA approved for North America. You can find out about the Olflex cables and their distributors in USA on their website: www.olflex.com
I used the 501203CP which is a 3 conductor 12 AWG cable and did 2 runs same as you, each from a different phase. On one phase I have my power amplifier and on the other one the entire front end through a PS Audio 300.
Good luck, and if you have any doubt dont hesitate to e-mail me back.