Just bought a Tmaxx 2.5
It's about the same as the stock servo.
I upgraded to a Cirius Servo. I don't remember the model number off hand but it has complete metal gears, BB's and 121 oz/in of torque @ 4.8v. It's a little slow but works very well and only cost $25.00.
Check Tower Hobbies for some good inexpensive servos. You can get something similar to what I've got for around $29.00.