I used the stock cable for a while, switched to Cardas, too sweet, and not much highs. I had then switched to Graham IC-70. It was much better than the Cardas.
I had purchased a Furutech cable, it's got really good reviews, but it might not work as the connector is really bulky and might not fit in the space under my table.
I've heard some good feedback with people upgrading the internal wires, I spoke with SME, and they would upgrade the wire to the silver wires used in the latest arms. Some SME V users swear by the Japanese Audio Note Kondo wires. SME said they would install it if supplied by owner. I've seen Audio Note wires by the UK Audio Note, but hardly any260866690769 info on the Japanese Audio Note Kondo wires.
FrankC