WELCOME TO YT! It's good that you're going to have your Belle spayed, just make sure she is done before your new boy arrives just to be safe. I found my year old boy for around your price range. I spent a total of $500 because I had him shipped. My one year old is a dream! Good breeders sometimes hold on to pups hoping to show them but sometimes it doesn't work out and they need to find them new homes. Here are some tips when your on the hunt:
http://www.yorkietalk.com/forums/yor...ead-first.html
Good luck and post pics of all your babies!!