GWS also makes a S03T-N or something like that that's faster, with a little less torque. If you're on a budget, you may want to look at those. I think they're .22 sec @ 4.8V, but I don't remember. However, for the .40 size plane you're going to put them it, you can probably do OK with any standard servo. (Futaba 3004, Hitec 425, etc..)