I need a new website designed to replace our current website.

We are a niche IT and Financial Services Consultancy. We currently have Joomla website based on a basic template. We want a new Website designed that has a good Content Management Service that allows us to edit the content easily. The site needs to be mobile compatible. The site requires basic functionality and we have some websites we can show that we like the look, feel and design of but other than that we are starting from scratch. The style needs to be corporate and professional. We will use most of the existing content of the current site but may add a few more sub categories within the services page. We would like to have the site finished within 1-2 weeks. We have selected WordPress as the sub category but we are no mean fixed on WordPress we are open to options.