You could probably buy a cheapo laptop to hold extra files/burn them to DVD. It might not be as cheap as a portable HDD solution, but you have basicly unlimited storage through DVD's and access to a computer that you know the capabilities of.
I really don't know alot about current camcorders or portable HDDs but wouldn't you need a computer to do the transfers or do they have hard drives that would download and store the data without a computer interface?
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