Take a look at this thread:
http://www.rcuniverse.com/forum/m_42...tm.htm#4275896
Good discussion. Don't skimp on servos on a pattern plane. Make a huge difference.
If you stay with the coreless digital Hitecs, and set the deadband with the programmer to 1, they are ok. I've not had good experience with the Hitec cored digitals; lots of deadband.
A new servo that came out since that thread was written is the JR DS821. It features very high resolution, good speed, good torque, at a bargain basement price. If you can stand the weight and size of a standard sized servo, it is a good choice for ailerons, single elevator servos, and perhaps dual elevators. For rudder, use an DS8411SA, or a DS8611a, Hitec 5945 digital coreless (or its replacement), something with over 150 oz-in of torque.
I've settled on JR DS3421SA's for elevator, DS 9411SA's for aileron, and DS8611a's for rudder.
I'm not sponsored by anyone!
Jon