I too love the annual Salvias. There are so many to choose from in both the blue and the yellow. All the pretty ones that I like to grow are definitely only annuals for us here and die off every winter. I only wish they continued growing like they might in Florida.
My favorite annuals are zinnias. They too attract butterflies. Another favorite are portulacas and Marigolds. I always rely on having some annuals to add season long color to my garden.