The servos you are using are fine. If you want to go up some, try a 2274 Savox servo. It will be overkill at first, but it is brushless. Amain has a really good price on them right now. The 2271 is another high quality servo that would be great in a 2wd, and it is stupid fast, but I would get the 2274 as you can use it in just about anything later on, and it is hard to break as well. I am using a 1257 in a Dex 410 4wd buggy, but seriously want either the 2271 or 2274. I use the 2274 in a Desc410 4wd sct.