It sounds like you and your husband are comfortable with the idea of becoming a multi-racial family! You already have a multi-racial extended family, which is wonderful. I think you are asking many of the right questions. You are aware of the fact that when someone looks at your current family, they do not necessarily assume that your first daughter is adopted, but if you adopt a mixed race child, all of a sudden your entire family will be viewed differently... not just you and your husband but also your first daughter. You have thought this through, and are aware of the issues you may face. I think you are probably well-prepared to face them.
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Perhaps the most difficult question you ask is "How will this child feel maybe being the only AA girl in the school?" My guess is that she will not feel comfortable. You also say that your neighborhood may change in the future, and it might. So let me ask you a question. I am not asking because I expect an answer, but I am just throwing this out there for you to think about, along with all of the other complex issues you are considering. If your neighborhood does not change when your child is ready to enter school, would you be willing or able to consider moving to a more diverse neighborhood?
You have said that your heart is aching for her. You know that you want her in your family. I do not think it is selfish. Your heart is open, and you want to welcome this child into your home. But most of all, you want what is best for her. "What is best for her" may well be becoming part of your family. But the nature of your family and the directions that your family will take on your journey through life together may change drastically as a result.
I wish you and your family the strength and wisdom to make the right decision, and the comfort of knowing that whichever decision you make is the right one. Good luck on the journey!