Clone of Wikipedia.org - Urgent

I need to launch a website which will have all the Functions & Features similar to [login to view URL] . But the website will be slightly different and unique. ** People should be able to Upload Videos . I need someone who can , 1) Design an efficient and a Great Looking website . I am really cautious about Looks . Again the website must be really Great Looking and really Cool . 2) A Super Cool LOGO . 3) I need the website fully Search Engine Optimized . 4) I also need someone who can promote the website . *** If you do a Great Job on this project , i will also consider you for future projects.