As a DH and Yorkie lover, I have a couple of questions. First does you husband love and interact a lot with the one you have now? Second, are you prepared to accept the next item that he wants if you get your little girl? I say trust your gut, you know your husband, and just how he will react to you bringing a new puppy home when he has said he doesn't want another, if you know he will get over it quickly(and who can say no to a Yorkie puppy), then go for it. Good luck, and I hope you don't get into too much trouble. I adopted a cat while out getting school and pet supplies one year, and showed Spooky to my wife after she had showered for work, she said that's a pretty cat whose is it and I told her it was hers, she loves Spooky, but I still get ribbed about her not being school supplies.
Cheers Quad & Gina
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RIP Megan 3/1998-5/28/2013