Custom eCommerce Website with Price Matrix

*PROJECT REPOST* Hello I have a new ecommerce project I need coding into a shopping cart of your choice - whichever will work best. OSCommerce, CubeCart, OpenCart, Magento are all acceptable - whichever provides the flexibility to do what I need You will first code the PSD into XHTML/CSS and then integrate into the chosen cart. Please bid and I will send you a preview of the home page (jpeg) to give you a better idea. Stage 1 Customer will choose the type of product from the drop down menu. This changes the image in the centre of the page. Stage 2 - Customer will choose the width and height from the drop down menus. The price worked out based on height and width matrix of product (see attached). The values the customer chooses are rounded up to the nearest price. Stage 3 - Customer will choose whether they want automation. If yes addition to price. Stage 4 - Customer will choose the finish they want. Different addition to price per type of finish, Price is calculated dynamically as shown on the front page and then they can click Buy Now to add to cart and go to to the checkout Could you let me know your preferred cart system, how the above will work and how long it could take Please show your past ecommerce projects Thank you