Look for a Novak/LRP/Tekin sensored set up, anything from a 17.5 to 10.5 (the lower the faster). You will need to adjust your gearing depending upon which motor you go with. Spend the few extra dollars and snag a good servo too. If your gonna go speeding around, you want to feel confident about turning

For batteries, most lipos wont fit in the stock spot on the RC10, so a little modifying will be necessary. Many many different ones out there, dont be afraid to get a nice big one (5000+ range). My personal opinion for a charger is get an all-in-one unit, like the Durtrax Onyx 230 or newer 235. I've been using one for racing for going on 2 years now, solid, small, light, and a workhorse.