Re-Design Web Site

We would like to re-design the following site: [login to view URL] . The site is the home page for a group of companies: Elaghil Trading, Yemen Garment, Cement Silos, Yemen Snack Food, Elaghil Solid Service, and should include others. Please advise if you can re-design the site to look simple, attractive and professional. I stumble into this site: [login to view URL] and the design I am looking for is similar in it's simplicity to this site. Please advise the cost of doing a whole re-design for the site or only designing 5-6 pages. Awaiting your reply. Thanks. Khaled