Check this out: At the HS I work at, we have both the 25 and .21 Savage. Savage .21 = $399. 25 Savage= $449. For $49 bucks you get an installed RotoStart, extra gears for off-road use or for more top-speed use, 3 shoe clutch, heavy duty dogbones, and a more powerfull 25 engine. For $49 it's a damn steal. But, it's a bit more if you don't already have a battery pack and a charger, roughly $50 more ($15 for a cheap 7.2v stick pack and $30 for a cheap charger). Even so, for $100 more you should be arrested for walking out the hobby store stealing all of that for so little!! 25 all the way bro.