component customization

i want to build a website like this one [login to view URL] your job will be customizing a joomla content construction kit of your choice (k2-flexcontent-cobalt-or any thing you prefer) please mention which one you are going to use in your proposal the main function is to list joomla templates & template provider -some filed will be displayed as image but submitted as drop down list like color field - there will be two type of content (template- template provdier) and a relation between them -a field to submit demo link for the template and showing the template demo with a frame with download link like [login to view URL] example link [login to view URL] you will not make a template but you will customize the listing of content and item display check the image file to give you an idea for item fields (this is an capture of bestofjoomla for demonstration only)