Power cord replacement suggestions

Just musing out loud here but hope some worthwhile thoughts.
At what stage do you consider it is worth your time and money to invest in upgraded PC?
I mean there has to be at least a certain level of quality to your system to start with for them to make any discernible difference? Not much point spending $300 on a PC when your disc spinner is worth $250.....

Seriously curious as I do have a fair sum tied up in my system but mostly in components.
Esotric SA-50
BAT VK600SE
ARC LS2
Usher CP-6381
Cardas Quadlink 5c xlr interconnects
Straightwire Octave 2 speaker cable

As the BAT requires 2 x 15a PC, I used the stock cords going to a dedicated 2 way box I made from hospital grade components with a 3 ft whip of 8 gauge cord and a wattgate plug.
All other equipment has maybe $50 PC.

Is it time to follow the White Rabbit down the black hole of PC improvements?

My experience has been that it depends to some degree on your components.  If you have a tube preamp, a good cord makes a significant difference. My Joule Electra preamps have always liked the old school ribbon style (Electraglide et. al.)  Next would be the source. But pretty noticeable tailoring can be done on the power amp side too. I can easily tell the difference going from stock cords on my amps, to Pangea 14SE or 9SE, to TG Audio HSRi, to a 9 gauge silver cord, and up, etc.  I suspect many of us have a box/closet full of many that have fallen by the wayside, especially because once they are bettered, there's usually no going back. 

@uberwaltz,
IMO, if a component has a Panel Mount IEC Connector Plug then I would add an upgraded power cord.
In your case you have a very nice system that will improve with the addition of upgraded power cords.
You don’t have to spend a fortune for power cords, I'm recommending several to you that have huge bang for the buck and in my mind are relatively inexpensive however that most likely depends on one's pocket book.
Listed in no special order:
Cerious Technologies Graphene (Red, Blue or Yellow)
Core Power Technologies
Anticables Level 3 Reference
Silver Ghost (sold on Audiogon)
Blue or Green power cord made with Furutech wire (my current favorite and a true killer of the ones I mentioned, in my system).

@lak
Thank you
I am certainly not against trying out some PC but just did not like the idea of throwing money after hard earned money away for possibly very little return.
Before the esoteric i had a krell player and i thought the krell was superb, until i upgraded to the esoteric....yes there was $3k difference in price but it was a difference I could HEAR.
Not implying I am about to drop $3k on any PC but you get my drift, whatever I purchased I would seriously hope I could discern something.
However as it is probably the single area i have not spent any serious cash on I should take deep consideration on your suggestions

@uberwaltz,
I totally understand ;-)
The power cords I recommended to you, can be purchased new for between $160-$650, most around the average cost of $300.
I know there are a lot of other power cords available, but the ones I mentioned, I have in my two audio systems. I've also owned and still have some power cords that range in price between $1000-$6500.
If I had only known then what I know now I could have saved some dollars! LOL, part of the hobby and learning cirve.