We are in zone 7A too.  A great annual vine for hummingbirds would be Ipomoea x multifida 'Cardinal Climber'.  If you are looking for something with a bit more permanence, Lonicera x heckrottii 'Goldflame' and 'Dropmore Scarlet' are very colorful perennial honeysuckles that bees, butterflies, and hummingbirds just love.  We've attached a photo of a Tawny Emperor butterfly on our Lonicera 'Goldflame' taken just this afternoon.