Since you are likely looking for an economical solution, I'd suggest the Novak Havoc 1s ESC. It is setup for 1 cell use only and nothing else will be needed. As for the saddle packs, yes you can use them as 2 separate 1s batteries but look through the classifieds and you can find the true 1s 12th scale packs for very little as well.
On-Road: VBC WildFireD08; VBC Lightning10; VBC Lightning12; VBC Lightning10-235mm
Off-Road: Not likely
Special thanks to EMRFactory and VBC Racing.