ORIGINAL: Kevin Ham

I'm upgrading to lipo batteries. First off, can someone briefly explain why lipo's are considered better than nimh? More importantly, what is a good charger and battery I should get? I'm looking to spend around $150. I'll be using it in my Stampede with a Castle Sidewinder Sv2 and 4600kv motor. What discharge rate should I be looking at getting? I think I'll want to stick to a 2s to start off, though I have my Pede set up strickly for onroad speed runs so I may get a 3s.

Thanks in advance.