Ajax contact pro is a great Joomla contact form module. This can be published on the body wrapper sideline, and the form submit happens with an AJAX submit without refreshing the page. You can set the parameters like admin email, email subject, etc. Highly configurable and backed with a 24x7 Customer Support package. This module is cross browser compatible and works on all the modern browsers. Bug Free and works great! Compatible with Joomla 1.5.x , 2.5.x , 3.x.x.
The Downloads Access and Extension Support is valid for 6 months from the date of purchase.