That's so great that you're seriously considering getting another pup for Coco to play with
I think that every situation is different, so maybe when she has the pups and they're old enough, you could go see them. Maybe one will come to you, and you'll just know this is the one? Boy or girl, I think you'll be fine either way. I love my boy, Miko! He's the biggest sweetheart and he loves to play, but he also loves to cuddle. We're going to be getting him a playmate sometime in the summer also, and I THINK we're getting a girl so we can experience having a boy and a girl.