Hola, te recomiendo darte una vuelta por JED:
http://extensions.joomla.org/extensions/news-display/articles-display/articles-showcase
Aquí unos similares:
http://extensions.joomla.org/extensions/news-display/articles-display/articles-showcase/12966
http://extensions.joomla.org/extensions/news-display/articles-display/articles-showcase/11309