Londonfog- I just want to commend you for doing research before buying a puppy from the pet store! Honestly, the fact that you're trying to gather some opinions before buying a pet store pup is so awesome. It starts with education and being educated before getting any pet so good for you, girl!
There are many people out there who fail to do research before committing to owning a pet so again, I think its great that you posted this thread.
Also- Welcome to Yorkie Talk!!!!
oh yeah- and I want to add that the pet store pups are very overpriced... if you do enough research you will probably find a reputable breeder in your area and end up paying about the same or even less than what you'd pay for a pet store pup that could potentially have serious health issues. Good luck- let us know when you find your little one!