Rails - Mar 2008 - Active Record attributes (has_many vs serialization vs sti)

I have a set of STI models, each have slightly different attributes.
While I could create a row for each one, I feel that there may be too
much null data in the database.  At the moment I setup a has_many to a
parameters table which stores key value pairs.  I want to find the best
solution for performance and simplicity.



1) STI for each field (I think new fields will be needed more than not,
and will require a lot of migrations)

2) Parameters has_many association.  Seems like overkill, not sure if I
am getting a performance hit here.

3) Serialize params via YAML or Marshal



Any recommendations?  Performance is primary concern, simplicity second.
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