Shopping Cart Template for a single product with Dynamic Price

The project is to create a form based shopping cart software template. [login to view URL] can be taken as an example, the project is almost like duplication of that site functionally. No design effort is expected from the programmer; working functional template of a basic look will be fine. You can bid for your shopping cart solution that you prefer. Magento, shopify, foxycart, or something else. Please include your reasoning for your prefered solution & we'll take it into consideration. We only don't want to implement using OsCommerce. Just take into account that the shopping cart software needs to be integratable to common payment gateways. There's only one product on the site, it's a customly printed item the price of which needs to be calculated. - There are types of the item, the drop-down list will be given. This doesn't effect the price. - There's some other form fields: 2-3 dropdowns, a radio button, a select, 2-3 text inputs, totally around 10 form fields of information that need to be stored with the order. The algorithm which needs to calculate the price of the product needs to take into account the following: - The number of products affect the price. For 1 product-> x each For 2-3 products-> x-10 each For 4-6 products-> x-15 each For 6+ products-> x-20 each - The number of remaining days to the chosen deadline affect the price For less than 24 hrs -> Price gets multiplied by 1.3 For less than 72 hrs -> Price gets multiplied by 1.2 This is basically it, let me know if you have any other questions. Happy bidding!!!