That puppy is adorable. The breeder I bought my yorkie from said the same thing, that the puppy should not be away from its mother until 12 weeks. I wanted a round face also. But when I met my Tucker I was in love within 30 seconds and he did not have the look I wanted. Then again, I have never seen a yorkie puppy that is not adorable!!
I know how you feel, it is a hard decision. Good luck!! I'm sure you will find the perfect yorkie.