It is not worth having a 3003 on helis at all, leave alone rudder as they are designed for cars. for .30sized begginer the best low cost would be 3001 or s148. on aileron, elevator, collective, throttle, and a better on on the rudder. 9202 if you want to be spending some extra money would probably be a better idea.
http://www.futabarc.com/servos/servo-application.html will give you an idea.