im doing it right now. i cant decide between TRX3.3 for my terra or a mamba for my DI. as for the firestorm, HPI doesnt have much experience in stadium trucks. after its out for a while and proven durable and all that is when you should get it. you dont need a charger and battery cause you already have those for your pede. i mean if you want that truck, then you could get that and a roto start system for the same price as the charger and battery.
this-
http://www2.towerhobbies.com/cgi-bin...?&I=LXMVE0&P=7
plus this-
http://www2.towerhobbies.com/cgi-bin...&I=LXPVD8&P=ML
and this-
http://www2.towerhobbies.com/cgi-bin...?&I=LXJ801&P=7
this-
http://www2.towerhobbies.com/cgi-bin...?&I=LXFD72&P=V
and fuel
add it all up and your around $325. you can get the rusty or the XXX NT for the same prices.