Photo gift ecommerce and photo uploader

I have an existing website and would like to add on an ecommerce platform to match my complement site that will allow me to sell photo gifts, canvas prints and photo prints from clients own images (ie not my work). My webhost allows for unlmited storage so cclients could register and store their photos online to make ordering easier A great site to look at is [login to view URL] and specifically [login to view URL] - Create a photo upload tool that checks pictures being uploaded for their size/resolution. - Based on size of picture offer specific size prints. eg. If it's a very low resolution picture we would only offer smaller prints/gifts. - Allow the customer to position their picture on a virtual canvas, and edit the photo. The outputs would then be included with their order in the system to allow our fulfillment team to print out the photo based on the system's outputs. - Payment option for Paypal only - Must have good CMS Note system should be able to handle large files in the range of to 20-40mb. Must be able to work on ipad too. Successful applicant will be asked to develop iphone/ipad app in future