E-commerce Solution for our current wordpress site

Our current site is LIVE and are using Wordpress. We want to have an e-commerce capability in our wordpress and looking for expert coder with best solution what to use for our wordpress. The ecommerce must be integrated with our current wordpress site & it has to operate flawless. We are selling services. The requirement 1) Build & integrate the e-commerce with our wordpress & the current design. ( the ecommerce must look neat + nice) 2) We must be able to create offer & people can buy them directly & pay (online & offline) 3) We want an affiliate link for every member who bought our services. and we want it to be tracked. 4) we want to sell images to the client also. ( When they purhase the service) they will have their own private gallery(photos of them will be uploaded by admin - upload must be in bulk. - the client can buy the pics directly.) 5) mass email. to users registered. the sales system must provide repots, sales reports. We want only experienced Coder to do this. We a specific budget of USD200 maximum for this project. passionate coder are welcome to bid this project.. looking forward to work with you guys