Not unless there is something wrong with what you're currently using. If you do require a new cable and want the best quality - search ebay and other sites for "made in Japan."
tonearm cable, do you need one?
I recently got a VPI classic 3. It has regular RCA outputs. All the arms I've used have always had built in wire with a ground on the end that hooks to the ground on the phono preamp. The VPI has a ground lug and I see RCA tonearm cables have grounds on both ends. How important is this? Do I need a tonearm specific cable?