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

Happened to come across what I believe to be the best power cord I've ever experienced...and it was free!  It beat my $4k plus PC's I have on hand.  Any guesses what it is??

@dave_b Sure, it's the stock cord that came with your Krell. 

Everyone, I heard an interesting presentation recently from Josh Clark -Lead Product Designer at Transparent Cable. An attendee asked "If I can't afford to add your cables to all my system at once, where is the first place in my system to invest?" The reply was the interconnect between source and preamp. I thought that was notable advice from an articulate and well informed source. Cheers,
Spencer

it is notable advice from a guy who sells cables

if a double blind test shows significant differences from interconnects then somebody really effed up the design of your components

if a double blind test shows significant improvements from speaker cables then you most likely have a speaker with unusual impedance match requirements ("not that there is anything wrong with that")

if you like your speaker cables then you can keep your speaker cables

if a manf. went to a lot of trouble to design a high cost component then it makes perfect sense that they would eff up the sound with a crummy cheap power cable, .... right???

The PC was from a Sony high end TV...does everything right and doesn't screw up the frequency balance or roll anything off!!  Had lots of Transparent including Gen 5 Reference.  Results were, how do I put this nicely...lackluster.  Their best stuff was the XL TECHNOLOGY...open and spacious with crazy detail and liquidity.