If you want reliable hi technology servos id go for MKS Brushless servos soon to hit the usa with a 13kg and a 18kg cnc case ,titanuim gears and brushless motor .

while most other servos on the market running at the pre world's were dieing the MKS had proven no matter what you throw at them even the garden hose like Josh paine did they never let up and they have no plastic gear ,There is no need for a plastic gear if you have top quality electronics and motors .

should be in the states by end of march