I looked at the pics online and if its the yorkie I think it may be she is really cute
. Of course in the long run it is your choice whether to purchase from them or not. Just be sure to go through that health guarantee they are providing you, even though I see they recommend their vets to save you money I would definately take her to a vet not in connection with the store atleast once to be examined. Also you didnt say how much she is costing. AKC is usually more and I also noticed that the registration papers could take upto 6months for you to receive, if you havent been told yet be aware that there have been people that have purchased with such agreements and never got their papers. Papers arent always important but you wouldnt want to pay a high price for a pup and not be given the papers. Yeah and as everyone here has basically told you unfortunately no one could guarantee you the weight of the pup as an adult. They could all just estimate depending on age and current weight.
I say spend some time in the store and monitor things in there and if possible spend a lil time with the pup to see if you see or notice any obvious signs of illness.
Heres the guarantee from them which i'm sure you prob seen already
http://www.puppiesdirect.com/ourgurantee.htm
I'll look for and send you some links if i find any breeders in ny or close incase you wanna look around. If you decide not to get her will you get your deposit back?