I too have had the Krell/B&W combo (802s such as yourself). However, after countless hours of frustration attempting to tame the Nautilus tweeter, I purchased a pair of Dynaudios and have never looked back.
Cardas if you want warmth. You must of had a bad experience with "other" cables. I own Krell electronics and ML speakers and find that a proper cable match is critical. I use Pure Note Epsilon Ref. cables.
My first recommendation would be the Cardas Golden Reference for speaker cable. In my opinion the Cardas Golden reference speaker cable has everything you are looking for. My Second choice with your system would be the Monster 2.4 speaker cable. You may find the Monster 2.4 speaker cable very engaging with the Krell amps. I owned a set of the Krell FPB/250 mono block amplifiers and found the Monster 2.4 cable to be very engaging. Also, I would take a look at the power cords and line conditioner you are using and perhaps make a change.
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