Bella is just over 9lbs, and I love her to pieces
I don't know about one with a "good pedigree", I think most breeders with good pedigree's only breed dogs that are with in standard ( 7 lbs or less), but I'm sure that there are some who end up being larger that a breeder would sell as a "pet" quality Yorkie.
There are a ton of people involved with Yorkie rescues on here, you could adopt an adult, then you know going in what size furbaby you have! Plus you also would be saving a furry little life