personaly, I use one motor.
The reference is "28mm Mabuchi Model Miniature DC Micro Motor 6-12v"
I use it with a 14volt power supply.
The key in good motors is the counterweight. A very light brass counter weight gave me better results than heavy one.
I choosed one motor also because since you can't really find 2 identical motors, on my boards 2 motors created a sort of "disharmony" in the vibration effect.
I think there is no secret receipe for motos : you have to test it. I tried about 4 diferent motors and half dozen setups before I found the best setup.
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