I run a Cardas Golden Reference 1.5 meter phono cable from my Sota/Graham/DV rig to my current C50 and to my C2300 before that. I think it sounds marvelous. My I/Cs are an assortment of balanced and RCA (very short Audio Classics CD to C50 XLR and very long XLR main C50 to MC302 outputs from a maker I don't remember, Vampire Wire silver RCAs from my pre/pro to the C50 pass-thru and some older Monster Cable RCAs from my Tandberg deck to the C50). Can't speak to the Shunyata cables.
After speaking with several different dealers, friends and reading a ton of posts here, I decided to run my amp directly off the mains but isolate all the line level stuff through an Ultrapower conditioner/surge protector. I use the standard Mc power cords with everything. So far, it's all working like a charm.
Hope this helps - good luck and happy listening!