I will say this: I have millions of the type of RCA cables that have come with equipment (VCR's, tape decks, DVD players, ect), and it posed problems with my amp/preamp in the form of hum and noise.
I used a pair of Straightwire Chorus to fix mine (as I got it for a real good deal), but something like the Belden 1694 or LC-1 from BJC should do very nicely.