Our girl chose us too. I could see from watching her with her litter in the paddock that she was a bouncing ball of fire, and I was looking at a black girl from the same litter that was a quieter dog.
But this pup came right over to my children and began licking their hands and knees, then sat down on their feet and began wagging all over while telling them how nice she thought they were. When any other puppy came over to investigate the kids, she wasn't aggressive but she shouldered her way in between the other pup and my kids. You can't fight that sort of endorsement!
She has proved to be quite a handful, but she will still place herself between me and any other dog. If the other dog barks at me, she raises up her hackles and just watches - doesn't bark or growl though.