Hello, I'm an award winning graphic designer & part of the Freelancer's Preferred Elite-level Workforce with 9+ years of experience as an Art Director for some of the biggest brands in the world. Some of my clients include: Sony Pictures TV Int'l, Audi, MGM, HBO, A&E, Guinness Beer, Sony Entertainment TV, Latin American Idol, Mahou Beer, McDonald's, Cartoon Network, Animax, Covergirl, Dove, Shaw Ross and many more.
My work had been proven to be of the highest quality available in this site. I'm not the cheapest option but I can guarantee you that I’m one of the most talented designers here. My experience in the branding world has been formed through many years of working with different clients round the world. Your brand will look unique and professional and make it stand above your competitors. Please take a look on some of the projects I've done on my portfolio: http://www.freelancer.com/u/lanu39.html
From the Brand Identity document that you'd uploaded, I realised that you're looking for a very professional and high quality design. I can guarantee that you'll get a design work above your expectations. Also, I agree that the color combination of yellow, light grey, white and black will reflect character and professionalism and, at the same time, modern and clean.
On the other hand, I would love to talk with you about the entire project. If you want to we can have a chat via P.M. or Skype videoconference. I'm always online during working hours for my clients.
Best regards