It sounds like you know a lot about yorkies already and you have done your research and know what you are getting into. I personally think it is great!!
I have three dogs (not all yorkies) and think it is better when you have more than one pet.. I can't be everything to my little guy so they have each other. I feel less guilty when I go out and love to watch them play and interact- it is better than watching tv. Oh the stories only a mom enjoys
I wish you luck, hope to see lots of pictures and hear stories.