are you going to race it? or bash it? If racing, how long is your straight stretch? I use a hitec hs65mg servo and seems to be one tough servo. I would recommend lipo batteries if you can afford it. And a good lipo charger like this one, http://www2.towerhobbies.com/cgi-bin...?&I=LXCTZ5&P=0, this charger can charge your tx while charging your car pack if needed. And about 1/2 the price of most lipo chargers out there.