Brushless motor/ESC combo??

Bondonutz: Thank you for the "Heads up". I've heard about Castle's esc's failing due to thermals (ing)? from a couple of hobby shops that had customers complaining about fires...(There's probably a lot of merit to what you said,I don't know...).
The single 8.4 pack was a cost-cutting idea,based on the fact that ESC's with lower cell counts-(NIMH/LIPO),tend to cost less....
Bashing is what mine's going to be used for...there are not a lot of good rocks where I live.High speed is not an issue-I don't need the kind of speed the truck is "supposedly" capable of from the factory...so,the 2 12 turns are out,(I want "quick",not fast.) So,if 2 packs(NIcad),or,2 2s packs are the way to go...so be it,right?