For electric tourer, if you are after lower weight, grab a futaba 9550, i think they are about 13 gras lighter than a full size servo, KO make sensational servos, but get any top line servo and it will serve you well.

I am currently running a MI2, i would not be too concerned about weight, while there are lighter cars out there, i still need to put some weight on the car even on rubber tires. And that is with running a full size Sanwa servo, and kit parts.