A brushed motor without gear reduction is practically useless for robotics. To move things (perform mechanical work) we could use gear-head brush motors, servos or stepping motors (yes, there's others...solenoids, piezo thing-a-ma-jigs, etc.) For locomotion, high-torque and 'horse-power', nothing beats a good gear-head motor. The gear reduction effectively multiplies the torque of the original motor, trading speed for 'umph'. The link below takes you to a matrix of the motors that I have evaluated so far.
Motor Matrix: [Link]
My other stuff (plant ID, kayaking, sea beans, etc.) [Link]
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