Well if you do get him, I would definitely get him neutered. And I would also think about getting the one you have now spayed as well. As far as you getting another
YORKIE, well that is entirely up to you
They are a great breed, but there are other great breeds as well. A Yorkie's personality just "clicks" with me though, and I have had several different breeds of dogs. But I gotta tell ya, I LOVE Cocker Spaniels and Mini Doxies!