Marrk - if you can try to get the 9402s ... they are kinda outdated now but they are great analog servos. I think the 3305 is about the same as the JR539s. If you want to spend more then the VR/VB are also great servos. Why not go with Hitec, they are reliable and cheap ... If you go to the ARF thread you will see the guys there use better servos on the FL Extra, I do not fly that much 3D so the JRs were ok for me.