When I was looking for a similar length extension cable I read a lot of good things about the Grado cable, but ended up buying one from Pro Audio LA. It's made out of Canare Quad L-4E6S with a Neutrik Gold connector on one end and a locking connector on the other and has a lifetime warranty.
They have an ebay store or you can buy direct from them. It costs about the same as the Grado cable.
They have an ebay store or you can buy direct from them. It costs about the same as the Grado cable.