The benchmark project in mind was the classic Flying Crank Ghost. Motors needed to be strong enough and slow enough to replace the $50 motor specified by phantasmechanics.
To deal with motors with high RPM, I demonstrated two inexpensive PWM modules available from ebay.com to control motor speed. (More information on Pulse Width Modulation controllers in a later post.)
Over the next few days I'll do a more detailed post on each motor.
Note: Thanks to Dennis Griesser (of Wolfstone fame) for these photos and all the closeup photos of motors to come. (Dennis - Could you please Photoshop away 20 pounds from me next time?)