I third the oval 9's, but am sure the speaker cables albertporter mention are all great too. There are about 300 he did not mention but could have. I have no idea if these are even a possibility for the equipment you mention.
In any case, I say start with the speaker cables. For me, the addition in my system (last) of the oval 9 speaker cables sent sooooo much information to my speakers that was not getting there before, it allowed me to really examine how the signal is assembled behind the speakers. Once in, it is much easier to identify and determine how, if at all, other components (like interconnects) affect the total sound output. IMHO,FWIW, etc., etc.
Chris
In any case, I say start with the speaker cables. For me, the addition in my system (last) of the oval 9 speaker cables sent sooooo much information to my speakers that was not getting there before, it allowed me to really examine how the signal is assembled behind the speakers. Once in, it is much easier to identify and determine how, if at all, other components (like interconnects) affect the total sound output. IMHO,FWIW, etc., etc.
Chris