RE: ofna servo
Most servo are an improvement over the ofna servos.
$90-$110 will get you the best servos you can buy.
$50 will get you some good servos.
whats your budget?
what are you doing bashing racing?
what batteries are you using in the car. 4aa or a rechargerble 5 cell pack?
what radio are you running?
JR, KO, FUTABA, AIRTRONICS are all good servos if you can afford them.
you will be looking for a servo which has about 120OZ of torque for steering and a speed of .15 secs or better.