Combining wordpress conditional tags to display specific headers

Theme: Suffusion

I am using the Widget Logic plugin to specify certain header images to certain pages. In order to display a header when someone clicks on a post, I need to add the conditional tag
is_single( ). To take this a step further, I want to split 'is_single( )' into two categories. Most of my posts are either categorized as Article, or Restaurant Story.

How would I write the conditional tag so that it incorporates both single post and category?

something like this?

is_single( ), is_category( 'Restaurant Stories' )

is_single( ), is_category( 'Article' )