Need a very neutral interconnect-

I found Superconductor iii very neutral in terms of tones.

Copper Audioquest sounds great with just about anything. Their silver cables are good too but the results can vary. Purist 20th is not that neutral. I would also look at Kimber Select and Tara. You would probably like them as well. If you call The Cable Company, they will send you anything you want so you can try them in your system first, before you buy.

I would not say that either PAD or Kubala Sosna are neutral sounding, that is why so many love them, they are warmer and more musical sounding. Neutral is a very gray area, it means many things to many different people. Many will recommend Nordost as the most neutral cable brand, but I think that Nordost highlights the high frequencies, which is not neutral IMHO. Stealth Audio, Tara Labs, and the Kimber Select silver cables are also considered by many to be neutral, or more revealing sonically.

the Kubalas are great sounding but are on the warm musical side, never cared for the Purist.

The new Wireworld Platiniums are fantastic very neutral with excellent information retrival and no artificial detail great cables for the money, David Saltz the cables designer's reference is no cable at all in the system he tests specifically for loss and they creates geometries which minimize any loss through the cable.