re lipo batteries/charger
a really good charger to buy for charging lipos is the duratrax ice. it enables you to charge lipos up to 8 amps but the only downfall about this charger is that it requires you to purchase a power supply.
unfortuantely most good lipo chargers require the purchase of a power supply.
another great lipo charger is the thunder power charger. it also needs a power supply.
as far as lipos go you will get plenty of runtime using a couple of 2s lipos 5000mah.
if your budget is under 300 you might want to buy the charger and power supply off of ebay or from another rc enthusiast.
the duratrax ice sells for around 120 plus the cost of a decent power supply( prices range for these depending on how many amps capacity it is)
have fun with your brushless