I was looking into the same myself. I've read many horror stories of aftermarket usb charger/sync cables from Amazon, some seemed to work "great" while down the page I read other users having theirs not fit right/fall apart at the connector.
I could definitely use a longer cable as the stock cable is just too short to use from the socket to the desk, let a lone if I'm under less than ideal places like a lounge/library.
TF700T + Dock
Currently: Cromi-X 4.6.5