PHP customized shopping cart website

i want to make a shopping cart oriented website. i dont want to go for opnesource carts since i am planning to link extra video and images to each product. so i want it to be customized. the products will be dynamic. and will come under dynamic categories. i can uplaod as many pictures for each product as i want. i also want to have an option to upload video for the selective product. I want to have paypal integaration and direct cards as well. i havent decided the other merchant services yet.. bt will do it fast.. everything should go in the design that is almost completed..