Take a picture of the "magnet" that you found, take a picture of the trigger wheel so we can see how bad its bent and post the pictures up here. You can host the pictures on photobucket.com for free, just sign up.
It sounds like your going to need a new crank sensor and possibly the trigger wheel. The sensor is about $80-100 if I remember correctly and the trigger wheel is about $8. You might be able to save the old trigger wheel if its not too bad, but lets see some pics so we can give you better advice.
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