The companies you mention are all fine shopping cart providers, but someone who's selling more then a few products (not even the size of Target) needs much more

The companies you mention are all fine shopping cart providers, but someone who's selling more then a few products (not even the size of Target) needs much more then a simple shopping cart. * Integration into their inventory systems and multiple warehouses. Do you want to be able to buy on the site, pickup in store? That means you need to tie your ecommerce site to your brick and mortar systems. * Do you have vendors that dropship on your behalf? You need a way to import their catalog data and send them their orders. Did they mess up and not have inventory by the time your order arrives, better have a way for them to notify you, so you can notify customers. * Gift cards that work online and in stores. * Customer service systems that tie to your e-commerce so staff can help customers. * Syncing all sales data to your finance, ERP, business intelligence and other back-end systems. * Returns? A system for RMA, tracking returns, issuing refunds and exchanges. Want to buy online/return to store? better tie your store systems to your e-commerce again. * Marketing? Have to tie your online store your e-mail software. Building a full fledged e-commerce solution is much harder than many realize. There are great tools that solve parts of what retailers need but there is no all-in-one tool to get a large retailer online and just working out of the box.