I used Purist Audio Designs Colossus Rev A. between Theil 3.6 and Krell KSA 250 with good results but I did not try any other cable so just a suggestion or starting point.
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Tried my Nirvana SL speaker cable on a pair of CS6s I auditioned with music from Jeff Buckley's Grace album. The way those speakers handle electric guitar--full-bodied and coherent, was amazing. The speaker cable wasn't bad either, besting the store's Transparent Audio (still a good match). An added bonus is that you'll only need a single pair since CS6s are not biwireable.