Take advantage of my experience. There is NO duplicate content penalty from hosting article excerpts on a category page. That's a myth.
Duplicate content issues arise when the entire content pops up on another domain. But partial excerpts on the same domain are NOT a problem. This is one of the main reasons I do not approve of some Wordpress SEO plugins, because they allow people to needlessly noindex category/hub pages, thus ruining their SEO, not helping it.