Im running a airtronics 94358 for steering and JR DS8550 for throttle on the st-r. Theres no need for such torque for throttle like what my servo has (188 oz ft torque) 100-150 is all thats needed. Steering is where you want the money to go for the servos if not both, I would say go buy a nice servo with no less the 200. I had the 94358 in my CRT once and it steered it with no problem.