Hi,
We have used "Gantry" Template in our DEMO, which is a free joomla template.
You can download it from here:
www.gantry-framework.org/download (make sure you are downloading the Joomla2.5 version)
I would suggest to download "Gantry RocketLauncher for Joomla 2.5" link. Which is the QuickStart package. After installing select the "Light" preset from Template settings. (the default is "dark") Then apply CleanMart on it... you will get the same layout as you see in our DEMO.
Regards.