56420 Third Party Shopping Cart

We are looking for a third party shopping cart solution. Similar to [login to view URL] [login to view URL] and [login to view URL] Some key elements - Perl or PHP Based - MySQL based - Payment Plug-In Capable - Admin Side, Merchant Side, Visitor Side - Language Support - Shipping Options - Tax Options - Multiple Product & Service Types All admin options should be configurable online. All merchant options including look and feel of store should be configurable online. Client should have the option to register or buy without registering, set by merchant. Ideas or feedback would be appreciated. Please provide examples of shopping cart based sites you have done before. Sorry but this is a major project, please do not auto bid or bid without experience and referencing sites.