For a 1/10 scale car, I'd go with the Maxamps packs. If you really feel like you don't need the punch of a 20C pack, then you can afford to downsize, so to speak. I don't see how you can say that it will only pull around 25A though. I'm sure that it will pull more than that in bursts. If you get a 10C pack and wind up doing lots of bursts, you could fry up that 10C pack.