If you're worried about the dangers of LiPo's, don't be. They've proven VERY difficult to damage, and give you several hours worth of warning before actually doing any damage.
a 7.4v LiPo with high speed gears, high torque motor, and a mosfet would greatly increase your response time.
The key factor for choosing LiPo over NiMH is amperage. LiPo's provide significantly more amperage, and therefore, more torque for your motor. And it's that torque that you need to get up to speed quickly.
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