Website redesign

I need to redo the following website: [login to view URL] .? New site needs to retain a lot of the same general formatting but we need entirely new content and need to move it to another domain.? Would like it to link to some of our supplier's websites but keep a shell so that the customer can easily navigate back to our site.? We also need to make this site so that it is very easy for our people to update the pages and information themselves rather than have to go to the coder every time we have a minor update or need to add a page.? Some sort of CMS like Joomla or others.? We do, however,? want it to look like a high end website, not a blog.? Would also like to optimize the site for search engines. Please let us know what you can do and what you would suggest for the above.