Speaker Cables _MIT SL-Matrix_ CH Acoustic X 20

Hi! I am finally ready to upgrade the signal cables in my system -- Boulder electronics and Wilson Speakers. I am considering MIT's SL-Matrix 90 with SL Matric 50i which sound fantastic or CH Acoustic's x-20. I have not been able to hear the X-20s but they have good reviews. I would love some thoughts on this process.  

Thanks