My enviroment is similar to yours G13. Small town with fairly stable clean power.
I just ran from a 15 amp breaker one run of 12-2 (yep 2 wire one ground) to a junction box where I then spliced 2 short (4 foot) runs of 12-2 flexible twisted wire cable to Hubbel connectors> (HBL4PBI 4-Plex receptacle Portable BOx in conjunction with IG420 4-Plex Receptacle-orange).
But what I did was drill a hole in the floor in the corner of the room where my "extension" cord comes up through the floor. I just pulled the carpet off the tack strips.
When I move I just have to terminate the set-up at the junction box, pull the four foot run up out of the floor, put the carpet back in place and go on with life.
The cabling I used worked FOR ME. (bought at Home Center,
plugs from W.W. Grainger)
Did make a differnce, for the better, in how MY system sounded.
In my opinion if your situation is similar to mine don't go crazy with what you are trying to accomplish.
For reference my system:
Threshold T-100 Amp
Audio Research LS-15 Pre
Ah! 4000 used as a transport
Perpetual Technologies digital engine
MSB Gold Link III Dac
Balance cabling where possible.
Niam speaker wires to Spendor 1/2's
And I'm as happy as a pig in ***t with how my system sounds.