The servos aeajr suggestes are excellent mid size servos. If for some reason you can't sourve these HiTech options then anything of the same size and torque specs will do just as well as long as they aren't some no name off shore brand with nothing but poor reviews. THis isn't to say that all offshore no name servos are no good. Just that some occasionally sneak in. A google for the brand and "review" as keywords often shows if they are decent or not.