Need logo for existing website

Hello, I have an existing website, called Show Me Food Trucks ([login to view URL]), that needs a nice logo for use on the header of the site. I would like the image to scale to a size of 700x114 pixels for the website, but I'd like a higher resolution image to use in printing marketing materials. The website tracks food trucks that roam the streets of St. Louis, Missouri, USA. St Louis is called the "show me" state, which is how the website was named. While the concept of food trucks is now new, there is renewed interest in them in the USA as they now serve unique and gourmet food options not found in cookie-cutter restaurants. This results in a fun and social atmosphere among food truck patrons while waiting in line for their favorite food truck. Please be sure to include a portfolio of past works. I will choose a contractor based on the style of work that I feel is best suited for this fun website. Thanks!