Interconnect help for a NEUTRAL system

I need some suggestions for ic's for my current set-up.

I have all Sonic Frontiers tube gear from top to bottom, my speakers are Martin Logan's and my speaker cables are Cardas Golden Ref.

Sonic Frontiers stuff are known to have no sonic signature and their sound can be described as "boring" or "neutral."

Martin Logan's are a little bright and quite fast in the mid / high frequencies.

Should I stay away from NEUTRAL sounding ic cables, ie. Cardas cables? Since it's an all balanced system, I would like to stay with balanced interconnects.

Thanks for your input.