RE: Savage X vs Revo 3.3 (2009 model)
not sure if the RTR comes with a battery and charger for the roto-start if it don't a cheap 6 cell 7.2 volt battery (stick pack) and charger.
for a savage recommended is integy alum tank guard($15) to protect the tank from cracking incase you whack it, and RPM center skid plate($13) to protect the tranny and break pad from debris that might get kicked up into it.
other than that I have yet to break a part on mine and I've sent mine flying quite high into the air.