Wordpress blog design

We need a wordpress blog designed with simple clean navigation, easily customizable, and a left side bar with a category section that has functionality similar to the [login to view URL] marketplace. There will be at least 5 major categories that we'll need graphical nav menu items for. We need the design to be easy to add content based on category and easily searchable to find specific categories. For example if I was looking for information on relationship advice I could click in the categories section, click on relationships and find a listing of subtopics underneath. The best thing to do would be look at these 2 sites below because we basically want them combined. We want the easy, clean look and feel of this one: [login to view URL] We want the site to function like [login to view URL] in terms of user experience. With the functionality of the [login to view URL] marketplace categories section: [login to view URL] We would also like it to look nice and require a very small amount of graphic design work. We would ideally like the design to work with the Thesis WP theme, but that is not an absolute requirement. If there are other comparable themes you can design with easier please let us know and we can likely use a different theme.