I am not single, but I did decide to get a second Yorkie when my Louie was just about 1 yrs old, and it is the best thing that I have ever done. Although Bella is a little yapper when people come to the door and Louie kind of learned that from her, so he will yap now too, but not as much as her because he is such a mellow little man lol. I brought Louie to the breeders with me to introduce him to Bella before I got her. They seemed fine together, so we all came home together and when we got in the house I put her in the "playpen" thing I have and let Louie sniff around and check her out a while. After a while I put him in there with her and they played fine so I took them both out and they have been best buddies ever since!
Good luck to you in whatever you decide, and please keep us posted!