I use cheap really super-crappy rca cables with a $2k pre-amp, $600 DAC, $500 cd player, rather nice amp and $1400 speakers (Klipsch Epic CF-1's) and honestly - it still sounds retardedly good. I have cables that cost $100 and upwards of that amount (speaker level, line level, xlr, rca, trs, ts, you name it - have had lots of very nice cables) and honestly, I may have heard slight slight differences between the those and the cheapest POS hunks-of-junk beaner cables but not enough to justify spending more difference than a couple bucks for.
I've had Aural Thrills, MIT, high-end monster cable (TOTL M-series and high-end studio trs cables), Pro-Co, Belkin, Hosa, custom cables that I and others have created, mogami, etc, etc., etc.
I'm just saying. Right now my 6 thousand dollar system is running with cables that most audiophiles would stop dead in their tracks if they saw and try to burn if they could and it I cannot near the difference I can between amplifiers of similar price differences. I would rather spend the extra $100 on a better amp than cables. That I know to make a