My son had a TRX4M (mini) and liked the car very much. Unfortunately, the ESC/RX combo died taking the motor with it (or the other way around). Right now, it looks like the cost of fixing it will be close to a price of new TRX4M. Are there any decent alternatives to a TRX4M? Any with a separate ESC and RX? He already has the big TRX4 so we are looking for a 1/18 scale.