I love sunflowers, and I always love having the plethora of birds that they attract. The birds help to keep the unwanted insects out of my garden and ensure that only the beneficial insects are there.
Helianthus tuberosa has edible tubers but, is VERY invasive but, delicious. The tubers are akin to a cross of a potatoe and a water chestnut.
The best way to keep on top of this guy is to pull any unwanted plants out as they come up or it will soon take over your whole yard. But, it's not as much work as it sounds.
Helianthus maximillanii is often used to grow a hedge that acts as a deer barrier and has nice flowers
Helianthus annus is the usual sunflower that has been hybridized and outcrossed to no end and comes in a wide variety of shapes, forms and colour. Some are really beautiful.
So, the sky is the limit.