Web design

I am looking for a web site designer / a web design company with solid proven track record and a good porfolio. Site is of 15 pages and it's for a engineering company. I want home page, menu buttons, images to be arranged more like in these sites like [login to view URL], [login to view URL], [login to view URL], [login to view URL], nvidia.com. Web applications in it is not required as requiredment is to highlight only the company information. Twitter news feed window required in main page. Facebook, Twitter and Linked in button links to be provided on right side of header and footer. In beteen some of the pages can can Facebook Like and Share button whereever required. Standard pages would be like Home, About, Products, Services,News, Jobs, Contact, etv.. Pls let me cost, time with live links of some of your works.