Well if it were up to me, I would have 3 or more Yorkies, but I only have 2 at the moment...My dh won't allow me to get another yet, but he said maybe someday
Anyways...I would do what feels best for you. If you really think you could benefit from another Yorkie, I would start the search! If you think it would be better just the two of you, I would say that just one is enough. You could always start looking at litters, and take your baby with you, to see how he would react around another puppy. We took Joey with us when we were looking for another, and there wasn't one breeder that didn't welcome him in to their home. If there's a puppy that just seems to jump out at you "take me home!" or you feel there's a special connection with, I would suggest trying it out. Good luck in your difficult decision!