The KST-DS-215MG are the fastest, most robust, and reasonably priced "high-voltage" servos in this class. We have found them to be "effectively invincible" in 150g bots (other than direct physical damage to the servo itself of course).
They can take direct 2S (8.4v), and have survived being stalled for entire 300mah packs. That's not reco
