Cant find the right theme!

I started a blog a while ago but the theme is giving me an itch! The look I am trying to go for is around the following:
http://hbr.org/
http://www.economist.com/
http://www.nationalgeographic.com/
but most preferably http://www.foreignaffairs.com/

The website I am working on is at experimentalthought.com

I would really appreciate it if someone could suggest paid or free themes that would fit the style I am looking for.