It looks nice, but I am not liking this very much. I know it is just one thing, but if one thing on a used RC car is bad, you can kind of expect the rest of the car to be a hackjob too....
Either way, it looks nice. I'd say a good 2S LiPO would be a good choice for now and a 3S LiPO later, once you can handle the power.
LiPO;
http://www.atomikrc.com/collections/...-with-uni-plug
Charger;
http://hobbyking.com/hobbyking/store...ischarger.html