We are CMS expert. We use Kentico for all our development.
Kentico is an integrated marketing solution that provides a complete set of features for building websites, intranets, online communities and e-commerce solutions on the Microsoft ASP.NET platform, on-premise or in the Cloud. It supports mobile websites, SEO, document management, online marketing tools, multilingual websites, and multisite management, and comes out of the box with 70 ready-to-use modules, 450 configurable web parts, and source code available by request

It features:

Easy-to-use editor	Full-text Search	Polls
Workflow	Blogs	Wiki
International Support	Reporting	Geomapping
Advanced Security	Content Rating	Message Boards
Rapid Development	Friendly URLs and SEO	Groups
Open API Extensibility	Media Library	Private Messaging
Easy Development	On-line Forms	E-Commerce
Forums	Image Gallery	News letters
Taxonomy	Web Analytics

Advantages of Kentico:

Kentico is used by more than 25 000+ web sites in 100 countries.

• Easy-to-use editing interface in a browser
• Full-featured content management system
• A complete, all-in-one solution
• Highly flexible and extensible
• Rapid development and short time to web