A good combo of speed and torque would be the Hitec 925MG (.08 transit / 103 oz/in torque @ 6V). The Hitec 645MG - is also a good servo (thats what I run) however it's a little slower than the 925MG but has more torque (.20 transit / 133 oz/in torque @ 6V). The 925 is 89.00 and the 645 is 39.00.