Yeah I love the sunflowers.
Have just got some mammoths to try. Supposed to have the jump on the giant Russians. Got some sunbirds too. Hard to beat a multi head variety when they flower. Tried a lot of the fancy ones, solar flash, and the other coloured ones but I like a long flowering period and they finish early I reckon.
I'd recommend the Mexican sunflower also, red flowers, non traditional I guess. Keep the old flowers cut back and they keep going. Native bees love them.
Drought hardy and if you stress em a bit by keeping them extra dry for a bit the red flower becomes even darker.
Growth pattern like canna, beautiful secondary growth.
Good plant to hide canna in when both in veg
Your garden looks great! Keep up the good work.