Savox 2274 servo is brushless and on sale for less than $100 at Amain. 347 torque and .07 speed @ 7.4 volts. It will have more than enough power. This thing is amazing and can snap weak servo arms! Your RX8 Gen2 can boost it to 7.4 volts. I am also running a Tekin RX8 with a Pro4 4600 motor.