One of my favorite geraniums is Brookside, I have 5 scattered throughut the garden.
The best one I think is still Rozanne though.
This one taken at SF Botanical Garden
My best self seeder is Bill Wallis, it's all over the garden in spring, easy to pull when done.
My other great self seeder is
This is my biggest geranium, usually about 3 feet tall when it blooms. It's a biennial so takes awhile to get to that blooming stage, and it's monocarpic but leaves behind lots of seedlings.
I had the pink one in my other garden, this shot was taken at Annie's Annuals.