look no further:
http://hobbycity.com/hobbyking/store..._10kg_/_.16sec
i have a few of these and they are great. i went through a couple servos in my crt truggy until i put one of those in it. they may not be the fastest or strongest, but they are rock solid and have more power and similar speed as the stock e-revo servos.
They say a good mechanic only needs 2 tools - WD40 & Duct tape. If it moves, and its not supposed to, duct tape. If it doesn't move, and its supposed to, WD40.