Vantage is a business directory theme by AppThemes. It uses the Settings API to render the options screen and controls, as well as a good use of sections. The main reason I wanted to showcase this page here, is the horizontal tabs navigation, which is also native to WordPress.
Scribu tipped this in a previous post (thanks!) and you’ll be surprised how easy it is to adapt, if you’re using the other (larger) tabs already. Just change
h3 for your