yeah, the stock lipo will give you more flight time as well as make the heli more capible because it weighs less.

about the charger it looks like you are getting it figured out. I posted on your thread over in the battery section. If you go with lipo you'll need to also get a balancer, or get a balancing charger.

How much money are you looking to spend? any specific features you are looking for? Has to be able to charge NiMH's and lipo's, anything else?