I am new to wordpress and need some help about choosing a theme. I want a free theme which is clean, professional and adsense optimed. I am not comfortable with html, css etc and so the less customizations I have to make, the better. I would have kept the default Twenty Ten theme but that large header image would kill adsense CTR. My site would be an informational site with large number of posts and categories. Which theme would be the best?