Analysis Plus is the most neutral product I have yet heard. The issue becomes what your system really needs. While I am not familiar with all of your system, I know the Thiels quite well and find them very analytical (rather dry and unforgivingly accurate as opposed to more colored and therefore forgiving). No one way is right, just depends on what your idea of ideal sound is. Analysis helped my very high end system improve some things that I personally like over top of the line AudioTruth (Dragon and Diamond). After 20 plus years it boils down to personal preference and confidence in your own ears. I find it is easier to trust my and my wifes ears because they are harder and more expensive to replace than the equipment.
Analysis Plus or Harmonic Teck
Could someone characterize the sound or recommend which of these interconnects\speaker cable combos might work best for me. I will be running an EVS millenium DAC2 into EVS nude attenuators into a White audio labs s-200 into Thiel cs3.6 speakers. Or perhaps you might recommend some other manufacturers cables in the context of my system? Appreciated