Has anyone "gone back" for siblings?

After we adopted our youngest, we found out that she has older siblings who are waiting to be adopted. We had planned on adopting again eventually, but we have always said that we would stay in birth order. Honestly, I am not sure how I feel about it. On one hand, I really want to parent younger children (our kids are considered "older" in the adoption world) and planned to request a younger child this time. On the other hand, that feels selfish when I think about the fact that these are my daughter's siblings. They are in a country where they will not be adopted domestically, and it is unlikely that they will be adopted internationally due to their ages/needs. Has anyone been in a similar situation...what did you choose? Pros/cons?