The TM EG700 is a tank of a motor. Not high performance, but reliable, efficient, excellent for builds under 400fps.
G&P M120-M170 easily handles anything from 380-470 fps at any RPM. But I've burned out two of them with 11.1v LiPos after a year.
If you're looking for something to push 400fps at 1500rpm, I've got an eagle force EF1300 motor in my 249 that's just a monster. Super efficient, real high torque, only drawback is it doesn't have the rpm of the G&P M140. But I'm running triple torque gears so that I could use a higher speed motor instead of a high torque motor.