interconnects vs speaker cables vs power cords - which make the biggest difference?


Like the subject line says, I am curious what others think in terms of whether interconnects, speaker cable or power cords make the biggest difference when it comes to noticeable sound improvements, or are they all equally important?  I am thinking of upgrading them all and am trying to decide how to allocate spending.  Thanks in advance.
ccandte
Radio Shack Pro 35 Titanium headphones, weren't they designed by the legendary Henry Kloss?  But no graphene anywhere?
Post removed 

Here is an experiment that you could try:

String a WalMart or Home Depot extension cord from your wall outlet; also do the same thing with a sub $10 power strip/extension cord.  

Plug in your after market power cord to the female end or power strip.

Then plug your after market power cord into your component(s).

This is a very good question... I haven't delved into it as much.  All I know is I like my cables. 
Keith I agree with you, once the extension cord burn in ,as usual you get more improvement, you need to move cables to see which one work on every component. Be patient leave cables for at least six days.