Use the wide container class I already have to make the content area maximum 960px wide. (e.g. the top of my style guide)
Apply the same wide container to the header. Put logo in left 3-4 columns and navigation links in the remaining columns. Trim down the whitespace between the header and content (but not too much; let things breathe).
For resolutions < 960px wide, let photos be full-bleed. Text posts should still have some padding on the edges for readability, though.