Magento cutomizations

We have customized Magento products, categories (foundation) and are looking for strong Magento developers to help us customize store further. This includes, -Support simple listings (product can bot be purchased), Coupons(can only be downloaded) and deals (purchasable) products + Customizations related to products. -Support serial numbers for deals (1 serial per purchase) -Customized invoice with serial, product details, buyer details (BillTo) -Customized product listings with Pagination (Products to be listed, retrieved via stored procedure) -Support additional attributes for news letter customization - Force news letter subscription to view catalog - Customize products page. -Add custom pages/form to store - Build/Recommend themes to purchase and modify and apply to store. Customization includes images/graphics development. - Build store pages and remove unwanted links/pages/references - Support Amazon S3 for static contents and for downloale products