A website for a small software company with one to five producst

Hi, i need a website developed with following functionalities. 1) it should look like this: [login to view URL] 2) it should allow users to download any software product that i have. these software products are allowed to be downloaded directly without any payments initially. 3) It need to have a product catalog, so that i can easily create/delete/modify software products. 4) it should give functionality to buy license for any of the software products that i have in the catalog. the license are generated using phpAlugen (see [login to view URL] for details.), which is written in php. It has all the functionalities to create licenses. We just need to call one method to create the license. Once the license is created, it need to be e-mailed to the customer. this license creation workflow will involve a creadit card payment. We will be using a third party payment merchant such as paypal for this. im OK if you use any commercially usable open source software for this purpose, such as drupal, joomla, os commerse. The site should be secure, very professional and easy to use. overall, the site is not complex, but involves a product catalog and online selling. I am open for any suggestions too. thanks for considering my project. -Hex-