I think my favorite idea for how to mount a motor is to do it off of a tandem crankset. That way you can get the advantage of using all of your gears with the motor, on the downside is that when the motor is running the pedals are turning. It's not exactly the cheap way to go, but it seems like the most effective way to use a motors (relatively) small torque band.
To clarify, a motor doesn't have a small torque band, but a bicycle has an ENORMOUS range of gearing. A motor tied to the wheel at a fixed ratio will either not have much starting torque or will run out of torque at the top end of your bikes speed range.
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