Nice, lots of white space, always a good thing. Subjective opinion - header area is using too much of the available space.
It's attractive, but you have a logo plus banner. Do you need them both on every page?
If you are using the banner to get the site's subject matter across, then move that into a tag line. Also, if you can get some of that into your page title, that can't hurt with SEO - if you're into that sort of thing.