Mike,
This is rather complicated, or rather simple, depending on what your reporting goals are.
You could have several Channels and Statuses and then have a Program for each unique part of the program:
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Email
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Download
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Survey
and each step has its own progressions and definitions of success.
You could have a fourth Program that tracks success of all three - that is, did someone go through all three? That would be its own channel.
You could also create a totally new Progression Channe with statuses like
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Invited
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CLicked
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Downloaded Content
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Took Survey
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Converted to Opp
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Won Opp
or something like that.
The next question is are you using RCA? If so, this is important to get right because your Programs and Channel Types drive a lot of the high level reporting of success.