I haven't listened to most of the range and my experience is limited to Black Knight interconnects (discontinued) which brought huge levels of detail, openness and slam to my system when they replaced the standard interconnects that came with my CD player. Certainly not warm. I found the sound to just be very clean, fast and detailed, but one man's neutral is probably another's sterile.
In my current system I am using Nordost Flatline Gold speaker cable. It is purely copper, and I don't find it to be too different to other copper cable. Just slightly more detailed and lacking a little of the mid/upper bass warmth that I get from my Oyaide Tunami speaker cable. Certainly not bass light, but I can see how people looking for some warmth and used to a little bloom on their bass might call it bass light or cold.
I'd love to have a listen to the latest incarnation of the Blue Heaven speaker cable in my system, but can't justify the expense at the moment.
I like Nordost, but I think I like detail, speed, slam and openness in my system so it works well for me. I've also often had it paired with kit like the Arcam Alpha 9 amp (which seems to be known for its warmth), so it has created a good balance.