Good start, I would do something creative with the banner/nav that incorporates a customer car. Maybe a slogan. The black background isn't my preference, but it isn't the worst thing in the world if maybe you can border it or use some whitespace somewhere. Friend of mine designed the titan site, kind of an example of a good banner/simple nav and a bordered background. (www.titanmotorsports.com)

Content layout looks nice, let me know if you need any future input on the webdev (its what I do..)