Rudder Servo
GP specify 65 oz.in all round, which fits the 9202 (70 oz.in) just nicely.
I think the 9001s are 54 oz.in, so are a bit marginal.
I've used 9202, 9204, and Hitec 5945 on rudder on a similarly sized model. If you will be really getting into the rudder, then the higher torque servos will make a difference. The 5945 felt like it could rip the horns out of the rudder, so maybe that was a bit of overkill.