servo upgrade (E-maxx)
 

which one would be better servo upgrade for the maxX?

HS-625MG
or
HS-645MG

or u guys could suggest sumthin else thats like cheap

The "better servo" would depend a little on tires. Larger tires would be better served with the 645mg servo, as it has more torque. The 625 is a bit faster though, and would be better IMO on smaller tires, such as panther komodos.

ima be using proline white 40 series Velocities and 40 bowties
so i would go with the 645MG?

That would be a wise choice.

If a servo is slower and more powerfull, you can adjust (put the pivotball in another hole of the servohorn) to get more speed or torque.

The 945 is the next step up, which offers the speed like the 625 and the torque like the 645. Then, the digital servos are the next step. I will have some 945mg servos listed this weekend. The digital servos(hitec) have been out of stock for a while from my distributor.