The pitfall I've run into when building CMS interfaces for the sales types is that they always want to do something you didn't enable it to do. The image always displays on the right, so naturally they want it on the left, and you end up having to go muck with the code anyway.

Sure, there are plenty of vetted CMS systems out there (e.g., Drupal, Wordpress, etc.), but they're massive overkill when you only need an events list or something.