Penci Design replied
Hi,
If you want use theme build website blog, news, magazine, i think you "Row > Penci Containter > Block content".
Penci Containter have default with is 1400px with sidebar is 300px , and content with width is the rest.
If you want use theme build landing page or multi purpose, you can you "Row > Block content" with with columns with percentages
Please check demo http://demo.libthemes.com/container/
Best Regards,
PenciDesign