The Joomla! Extensions Directory ™


RSform Pro
This has to be one of the best plugins I have ever bought.
I build websites in Wordpress but this specific client already had his website setup in Joomla - this is when I decided I will need a form builder.
The support level that came with it is fantastic, well worth the investment.
The plugin itself is quite powerful - I've had some initial issues setting up an email message and RSJoomla was quick to guide me into solving them (I'm using Joomla! 2.5).
Highly recommended.