Need help buying new speaker cable

The ONLY answer: The Cable Company. Try before you buy. Get 5-6 pairs of cables, spend a week or two critically listening, buy the ones that suit your system and your preferences best. If you cannot hear a difference, either your hearing is bad, or your system (speakers, electronics, ?) is lacking.

Only way to  to know definitively is to try em. Your system, your ears.  
Looks like the majority indicates repair existing otherwise.  

Knowitall10   You may not notice the difference in cables with a Triton one R tower due to their wild impedance response. Too much signal obscurity using coil speakers and passive crossovers.  Certainly no difference with anything higher than 3N purity unless you get your conductor configuration below 4 ohms.  Even then the difference is a long shot.  At this impedance and being unbalanced, there is no indication for shielding to lower noise.  As you know from your EE and cable background the entire scheme of signal transmission needs to be redeveloped, otherwise like many readers, a satisfactory end point is never reached. 

I talked directly with Audioquest and he said bi-wiring sounds much better.  Then I watched a video produced by Paul at PS Audio and said with the quality of speaker wire today there is no need to bi-wire.  He said he doesn’t bi-wire.  He did say he blind tested speaker wires and said he was blown away when he heard a pair of higher end speaker wires.  He was startled and literally blown away.  Up until then he was not a believer.  I get confused.  Some people swear expensive cables are worth it and others are not.

It looks like the majority say repair my TARA LABS APOLLO cables.  I think most feel there isn't much of difference in sound between cables?  Problem is, I have not heard anything but what I have been using in my system to compare.  Might find some loaners to audition.