BTW if you want to bone up on motor sizing there is a couple of usefull sites.
http://www.motionvillage.com/welcome...es/Inertia.PDF
and
http://www.imshome.com/Product%20Man...ox_inertia.pdf
as shown on the sites, the torque required to accelerate is reduced by the square of the reduction ratio, so a simple 5:1 reduction reduces the torque required by 25.
BTW this practice should be used when sizing steppers and servos.
Load Inertia-to-Rotor Inertia Ratio
For a high performance, relatively fast system, load inertia reflected to the motor should generally not exceed the motor inertia by more than 10 times. Load inertias in excess of 10 times the rotor inertia can cause unstable system behavior and inefficient power usage.
Al