I've used the Hitec 6 series on 60-90 planes. They're nice, but centering is not great.

Check out the Hitec digitals. How can you beat $55 for a digital servo?

http://www.servocity.com/Products/Hi...tal_servo.html

I use one each on the rudder and elevator halves of a 20 lb, Brison 3.2 powered stinger. Good stuff.