I'm not sure how I overlooked this extension, but I've looking for a AJAX-enabled forms builder for Joomla! for two years. Building forms have always been painful, but those days are over. I've only been using it for a few hours and I'm convinced this extension will allow me to do anything I want. It's so intuitive and easy to use. A must for any Joomla! developer. Support these folks by purchasing one of their subscription plans.