Thesis Wordpress Theme 2.3 & 2.4
Once I find a great theme, I will stick to it for life. Thesis Wordpress theme version 2.3 and above have been fabulous and help a non coder like me to develop simple, functional and optimized sites.
Here, you would find tutorials that helps you improve your site based on what Thesis already have and possibly with the help of a plugin or two without using any custom CSS.
If you know coding, the sky would be the limit with this theme.