Many of our dropshippers are using Shopify and they are extremely happy with it. What is amazing with Shopify is that it's very user-friendly, it's easy to install templates and to install the plugins you need. They also offer great customer service and Built-in Speed & Security for Hosting. The only downside is that they charge % of every sale you make, but I guess that's just their business model but if you are looking for an all-in-one ecommerce solution for your online store, and you are looking to grow and add products – and you have a little bit of technical know-how, then Shopify will be a great fit for you.
Otherwise I would also recommend woocommerce :)