Cables:Harmonic/Nordost/Cardas

I'm new to this high end stuff. After buying a Conrad Johnson PV-11, with a CJ MF2300 SS amp, fed by a Thule CD100, all driving a set of Audio Physics Virgo's; I find out I need to get speaker cables. So now for round 2 in the lets get educuted/serious confusion, about music. I need at a 12' because of the funky space that I'm in (ie read to achieve marital bliss with all this big stuff in the living room). Right now I have 15 year old, first generation monster cable. My guy who got me the CJ stuff has a 14' run of Cardas Cross ($850). Originally I was going to get Nordost Red Dawn from him, but it was to short. I have since found some for $850 that would work. I have also found some great reviews about the Harmonic Tech Pro 9. I did'nt find the pro 9, but I can get the Pro 11 for $500. I'm sure it will all sound better, but what do I get? Secondly, it seems that buying used cable will get me over the burn in period. Any thoughts? Luc