I will throw in a vote for either JR (excellent warranty and customer service!) and Hitec (tough as nails!) for my servo needs! I have a set of JR 8800's in my buggy, 8800S for throttle and 8800T for steering. We'll see how they fare this summer! If summer ever comes!!!!
If I have steering issues I will swap in a Hitec 5955 ( 333 oz of torque! ) or the new JR 8711 ( 403 oz torque!!! )...
Both are around the $100-$125 area...