Matt, I would suggest you to choose the version number one so would build a redirect for every indexed page. Depending on your previous site architecture you may solve this with more .htaccess files but can be arranged with only one as well, but I suppose that a longer single .htaccess would slow down a little the site.
Why do I say that you should go with the version number one?
Simply because that would be the most effective way to keep the existing rankings. You should size up the situation knowing the actual traffic statistic.
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