Nasaman, Judging from Al's post Sunnyjim's speakers will be a good neutral test for the differences between cable and he will be able to hear the synergism that he has already established between his electronics and his speakers. Then he can attribute what he hears to the cables as he changes them, the total synergy, or the basic system in toto or to individual components, as he sees fit. He appears to be fortunate in the sense that he won't have to listen to a lot of different cables before he can determine which, if any, can give him what he is looking for.
A challenge for you.
Since you have stated that the Harmonic Tech Pro-ll is the most 'musical' s/c, and you imply that your system is synergistic and suitable for evaluating cables without considering the technical speaker/cables matching issues, perhaps you can take a moment and tell us specifically what attributes that cable possesses that makes it 'musical' in nature that the other cables do not. Are you sure it is embedded in the nature of the cable, i.e. it will be 'musical' when used in all systems, or could it just be the result of its synergy with your system. In other words as you describe the differences in the cables as slight (in an already synergistic system) can you attribute the differences to personal preference as opposed to technical differences?