Well,if you want to use lipo batt for your 1/12 scale, is better that you choose the ESC which have the lipo battery power cut off. (Is a MUST).
If you want to use a OK quality, then i prefer you to use Hobbywing 60A ESC, cheap and the quality is not bad! Also, you have to think of what kind of batt is suit for you 12仔.