what do you think about this motor and mm esc and ruslter

Id recommend finding one with a 1/8" shaft instead of 5mm, but that one could work fine. To use the 5mm shaft version you would have to swap to either jato spurs and 32p pinions or revo spurs and mod1 pinions. Since the stock 48p spur will work fine for 7-8 cells, I would try to find one with a 1/8" shaft.