I'd take the last layout, I'd have the old subforums and groups, old-to-new posts, 25 posts-per-page, but keep the name changes, the picture/video linking, and the tags.
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Basically how the site used to be, but with BES a normal feature. That is: - Embedded images - Collapsible quotes - Other stuff And the post formatting options we have now, such as italic, bold, and url buttons.