Digital Download Website

Project: Build a website for digital downloads only - Stock will be in the form of PDF downloads - Digital Sewing Patterns - Software must have the option to watermark PDF with customer name and e-mail address to deter piracy (extremely important to have this available) - must be able to produce sales reports based on brands (for example, I could have 100 pdf products from one supplier - I must be able to produce a monthly report of what pdf's sold from that supplier). I don't have a platform yet, as I find that few website companies support what I'm looking to get done, so I need advice on this: Magento, Wordpress with plugins, etc, etc. I haven't purchased hosting, so I'm open to hosted options as long as we are able to add plugins that will tweak the site to what we need it to do. As mentioned early it's VITAL to be able to watermark downloads. As this will be a download only site, it should be pretty straight forward project apart from ensuring that all downloads are watermarked, main work will most likely be the installation of a theme and tweaking it to suit the business. Payment gateway setup, no shipping charges will need to be setup, link to social sites, etc. When placing bid please provide the following: -The website is for selling pdf sewing patterns. -Platform suggested and any plug-ins that might be needed (this is for me to assess what it will cost me on top of your fees) -Source of your themes or are you designing from scratch? -Provide as much information as possible of your thoughts for the project. Bullet points is sufficient. Any queries, please don't hesitate to contact me. Thanks you.