Modernising Our Sixfold Web Site

I need someone who can improve the look and feel of our web site (www.sixfold.biz), to update it. I want to work with someone who can make the site look attractive to senior management, modern sales teams and bidding professionals.
The site must be generally based upon the existing site. Our business logo and its colours must be reflected in the theme for the site. We need to give the message of high expertise in our niche market.
I need the individual pages and the site navigation to be improved. I must have the ability to add more information and pages as needs arise in the future.
The project will be finished when the new web design is uploaded on to our web server. Then, I will be looking for continuing support for the site following the update (separate proposal at a later date).
I would like to see some thoughts and ideas, so I can make my selection from the proposals I receive. Plus, I need a fixed price for the proposed work with a price per hour of any additional or continuation work.