Just adding weight ot OD's advice - the 9602 is the 'daddy'. I've got two, had both for almost four years, and they never miss a beat. With metal gears you just never worry about them, and they are accurate and quick.
As 12th is sooooo much about the steering accuracy, to make any other choice of Futaba servo type is not worth worrying about the odd $5. There are other makes, but this is the value choice. HTH
