If you still want to go brushless, as long as the receiver and motor controller are two different pieces in the setup, all you would need sould be a brushless motor and controller. If they are in one package you will also need a receiver. It will run on your present battery packs, but will do better on LiPo packs, and you may be able to upgrade to 3S packs with the brushless, but you don't have to do it all at once.