You really should try and stick with a metal gear servo.
that servo has reasonable torque and speed, but the Nylon gears may not hold up for you.

For steering in the Futaba line, I like
9402, 9450, 9451
At around $90 they are not cheep, but I've had a 9450 in my buggy and Monster truck for over 2 years with Zero problems

Good luck