I don't have any breeder suggestions but I would like to say, again, how sorry I am about Sophie. I think it's great that you're keeping your options open and may get another dog. You will know when the time is right.
P.S. I keep watching Sophie's "zoomies" video and it cracks me up. I just showed my 10-year-old son and he said, "I hope our puppy is like that!"
Take care!