Custom T-Shirt Design Web Site

Looking for a complete web design for the sale of customized products such as T-Shirts, Mugs, Mouse Pads etc.. I need a complete system where visitors can select product (TSHIRT), then select graphic, size and garment color. An option to have additional text and placement of graphic (back, front of shirt etc..) is also a requirement. I would like for visitors to see the final result of product with image and optional text. I would also need an administative front end to upload add products, define variables and upload images. The completed solutions should also include a credit card payment gateway interface and a sales/tracking module. An example site that we would like to model is www.customink.com.