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
I'm an expert on the subject..

I've done a complete system change " once"
and I'm at lest 30 miles away from person with question.........lol


so: my "absolute" answer
1) power cables & outlets
2) interconnects
3) speaker cables

there seems to be a relative agreement?
Surprisingly 
jeff

My current system weighs a total of 12 ounces. Battery power, so no power cords, no AC power, no AC ground, no interconnects, no digital cable, no speaker cables. Also, no transformers and no fuses. But very low distortion and gobs of air.