I currently have 5 websites with 10,000+ products built on an outdated ecommerce platform and am considering a move to Magento. I need a consultant that understands the Magento architecture and administration that can help me build the infrastructure right from the start so it can be scaled up for future websites/products. For the first phase, I would like to take a small sampling of my existing products and upload them from a csv/xml file to Magento with all required special attributes...