I got my yorkie from
http://www.durreryorkies.com/
My little girl has a terrific temperment, cute and she's full grown at 6.3lbs. I'd buy another from her in a flash.
When I take her out... Im constantly asked where I got her from. Even yorkie owners have commented that she is so cute and a couple have said that she is much cuter than their yorkie.
I've seen lots of yorkies, big ones, long legged ones and maybe I'm biased but I've only seen one that is just a cute or cuter than my little girl.
Good luck in your search.