OT Smarthouse is best suitable for furniture- or kitchen websites. OmegaTheme realized it on their OMG Responsive Framework, which is ready for desktops and mobiles. OT Smarthouse comes with K2 and is ready for Joomla shop extensions, like VirtueMart. Its source code is well commented. So its easy to adapt it, as you want. The collapsed menu makes the navigation unique to other templates. The download is commercial. Its native for Joomla 2.5 and will be delivered with HotQuickStart.