E commerce shop

I need a new shopsystem for the site [login to view URL] The admin system used today is old and not working properly Not interested in large open source systems as Osc and similar The site only holds 10 products and needs no registration and other unnecessary features as it is in all open source shops. The steps are as follows 1, Choose product in menu 2, Info about product, price and amount 3, Filling of customer details 4, Pay - Copy of each order should automatically be sent to the shipper without price info - It should be easy to change price and info on products in admin section - All customer emails should be fetched autmatically to a newsletter The site must be extremly SEO friendly, so you must choose correct code for building Thats it