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

@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