Clean -very professional website design

Urgent: Must be completed within one week. Client requires sleek, clean and professional website designed for a boutique consultancy. Site structure is relatively simple, but "design" is the key word. Must look good, be well thought out and function flawlessly. Company identity and logo exists, so site should be designed around that. Content will be relatively static, but we would like to be as flexible as possible for adding features later. We have worked with Joomla and would like to go that way for this as well, but open to other platforms. This is for a new design - including: Graphic/photographic elements (we have some ideas) Color/shading scheme Fonts and type size/layouts Please do not bother if you are just going to plug in a template.