If you want to use Hitec, I would not get anything in the 600 series. The 3 core motors are more prone to failure than the 5 core or the coreless servos.
I have had a much higher failure rate with Hitec, but in certain cases it has to do with the servos that I have selected for certain applications.
Throttle/brake is is much harder on the servo motor. Do not select a 3 core or a digital servo for this application. Use a 5 core or even better, a corelesss analog servo.
Steering seems to be harder on the gears in a servo. They do work the motor as well, but plastic gear breakage is quite common as well. I would still use a 5 core, or a coreless over a 3 core. Digital works well on steering. Metal gear is highly suggested.
My opinions, but the info regarding digital servos on throttle/brake was given to me by Hitec and Airtronics.
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