I'll be praying for you. Among all the usual, I'd really check out the lines of the parents and grandparents for health and temperament issues with the breeder, find out how much the breeder seems to know about those subjects of this litter's heritage, why it matters to you as a potential owner of one of the dogs, etc., and what health certifications or history both mom and dad have, etc. You can't hardly go wrong with any Yorkie you choose, though. Here's hoping you hit the jackpot and pick out a little blessing for yourself just like we all did!