I have C4s and I think Grover Huffman's speaker cables sound great. They are cheap too. I have a lot of expensive stuff over the years and I think Grover's sound just as good
I'm not espousing spending lots of money on cables just to make you feel like you have "awesome" cables, but your amp and speakers are of such a caliber to justify cables that will bring out the best in your system. I recommend a call to The Cable Company. They will give helpful suggestions to you and then you can audition different cables at home. They were helpful to me a few years back when I had C1's with Simaudio I7.
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