CMS for newswebsite

Our company will launch an online news website on which articles and messages will be posted numerous times a day. The layout of the site can be fairly similar to either the popular [login to view URL] blog or to the site of the NY Observer newspaper like this: [login to view URL] We will provide the Graphic Design of the site ourselves, but we are looking for a party that can develop an easy to use and maintain Content Management System, CMS for this project. (the layout/graphic design will be of a similar nature to the 2 examples mentioned earlier.) Projected traffic can be assumed around 100k unique visitors per month, possibly 600k page views. Aside from a price quote we would like to receive some references and a description of the process as well as the technologies to be used.