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I personally would go with WordPress as well. WordPress is easier to understand, and it is more popular as well. Less people are familiar with Joomla, so there would be a more difficult transition period if you ever decide to pass the site off to someone else or ask someone else to help. There are also a large number of plug-ins for WordPress, and the cost of hiring help is relatively inexpensive. From an SEO perspective, I believe they would be about equal.