Shopping cart customization and installation

I would like to add better e-commerce capabilities to my company's website. I think a customized version of an open source cart such as osCommerce could work, although I am very open to suggestions about other solutions. Current situation: - I am bootstrapping a startup and am the only full-time employee. As such, affordability is very important. - My company's website is http://www.fullpro.com. - I have a dedicated SSL certificate for my domain (e.g. [login to view URL]) - My web hosting is by 1and1. I have the business package, which includes many mySQL databases and PHP. - I currently have an Echo processing and merchant account, although it currently only is in use for a B2B payment form (that is not part of this project). - I currently use PayPal's basic (not pro) "shopping cart" & processing -> this is what I want to replace. I like most elements of the current system, but I don't like the fact that customers have to have (or sign up for) PayPal accounts. Also, I need much more robust Administrative functions. Please see the attached Word document for fairly detailed specifications. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform Must be installed and run out of my [login to view URL] Linux Business Hosting Package. I use a Mac, but I don't think that should make any difference.