Servo motors for robotic arm

I need some advice on quality hobistic servo motors. I am doing robotic arm for my final project at college. Now I'm using cheap Tower Pro MG995 motors from ebay and although they are not bad for their price, I have a problem with jittering. I tried to fix it with code and it got better but I am still not satisfied enough.
So I want to buy a better servo in a price range 20-30$ a piece. It needs to be controlled with digital signal and torque at 6v needs to be around 15-20 kg/cm or higher. I want it to be precise as possible for that price with minimum vibrations and jittering.

This one seems pretty good, and customers are very pleased with him. If somebody has tried it please help with informations.