Well I'm thinking brushless might be a tad fast for the little one, would the 540 type 23T motor that the mad rat comes with be OK with a lipo running it?
Then I'll have to research a battery/motor combo for mine.
Basicaly looking at running both cars with the same charger at least to start with, keep the little ones car a touch slow and mine a bit faster
By the looks of it though going to go with the mad rat and B4 stealth buggy.
Seems a good compromise between cost and performance, plus the little ones been watching videos of the mad rat and really likes the green one