B4 factory team or even a T4 factory team if you like stadium trucks
buying the b4 stealth you'd need a few parts to get it up to the strength that the factory team version is at and would end up costing more than the factory team and you still wouldn't have some of the parts that the factory team car has that you'd benefit from so best to go straight for the factory team versions unless your a person that already had a stealth version to get the few upgrades for it to get it upto scratch