I am not inclined to invest many binaries in subversion, except, possibly, versions of a final product. As a rule, if I can generate something on the fly, I don’t worry if it is not too long to generate them, then I just insert them there.
However, I would rather drop a copy of the latest documents (regardless of whether I can distinguish them or not easily) in svn if this makes my life easier. It is always good to be able to copy (whether it is the latest or previous version) when the boss or client says: "Do you have an xyz document from October?".
As for your specific needs, well ... only you know for sure, but disk space is cheap, and if there is value in their presence, I would do it.
Only my two cents.
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