New Joomla Website

We are looking for a Joomla developer with Graphic design skills who can develop a new web site for us with the latest version of Joomla. Our company have 2 existing websites ([login to view URL] and [login to view URL], developed in Dreamweaver) we want to use most of the existing content, merged together under a new Joomla site and new domain. *see enclosed directory structure We have spent an extensive amount of time working on the SEO and have many links to these 2 sites, with this in mind we want to ensure that any work we have done so far is not wasted. We are looking for advice on this point i.e. what is the best way to progress this? For example if we simply redirect the existing domains to the new domain how will this effect our SEO. We want the new site to be visually attractive and as a guideline we like the look of [login to view URL], although copy, images and video will be used from the existing site, we want somebody to design a completely new look, possibly improving upon the existing images and adding new/ generic images. Please provide relevant examples of work with your bid.