No biological kids. In my opinion, there is no reason to produce biological children when there already are millions of parentless, unloved children in foster homes.
That being said, some days I yearn to take care of a child - to know I have given an existing being the opportunity to a better life.
A couple of years ago, in Portugal, there were more couples looking to adopt than "viable" children up for adoption. While your statement makes total sense, it may be a insensible option on your country. Make due research!