CCKs like FLEXIcontent, K2 and ZOO would allow for great opportunities to build your own Magento catalog-pages within Joomla!. The missing link is to have CCK-elements that allow you to reuse specific Magento information (like product pricing, an add-to-cart button or even complete Magento blocks) within that CCK. MageBridge 1.7 will focus on this functionality.