Magento is a feature-rich, professional open-source eCommerce solution that offers merchants complete flexibility and control over the look, content, and functionality of their online store. Magento’s powerful marketing, search engine optimization and catalog-management tools give merchants the power to create ecommerce sites that are tailored to their unique business needs.

Joomla is an award-winning content management system (CMS), which enables you to build Web sites and powerful online applications.

Servint is a serious, very experienced company, offering hosting services since 1995. They seem to be renowned especially for their managed VPS services, but also for the dedicated servers services.