choosing and understanding spindle motors

[cyclotron]

Hi all,

I've been trying to find a small dc motor to runt he spindle on
my gantry type machine. ( here is my thread cyclotron's cnc gantry ) I am using a Taig spindle and I originally intended to use their .25 HP ac motor. I quickly realized that this thing was way too big and heavy to be pushing around on the gantry, so I started looking for alternatives. I found this
>>> http://www.mechanicalphilosopher.com/kshaw11.jpg <<<

note the small motor being used, it is a swiss maxon dc motor. here is what the owner says about it :

" The DC motor is rated at approx. 0.15 HP but has lots of torque -- like 100 oz-inches (continuous, 500 oz-inch max) at the step pulley shaft running at around 1550 RPM i.e. I can run the motor up to 8000 RPM continuous with no problem at all, and I use this to advantage by using a base reduction gear of 1:4.5 So I cut some small 6061 T6 aluminum parts up to 3/4" diameter and ripped off metal at a high rate, just like the GE clunker"

I took this as a sort of proof of concept for finding a small but powerful motor.

Anyway according online power-RPM-torque calculators, my Taig motor outputs 73.64oz-in (.52 Nm) of torque at its standard output of 3450 RPM

I have found a maxon motor for sale (surplus) that claims to have a max continuous torque of 280 oz-in and a no load RPM of 5280. On the surfac, it would appear that the maxon motor outputs more torque at a higher RPM than the Taig motor. Somehow this seems too good to be true. Am I missing something? Are there other factors that I should be looking into?
Also, can anyone think of any alternatives to this problem of finding a smaller motor? I intend on milling plastic and doing some light aluminum facing and drilling. Any insight would be very appreciated.