Adoption of Pre-teens

We have been matching for about 4 months (straight adoption) in PA and out of state. Our PA SW does not really do any matching for us. We just look at the website and then inquire. AAN is wonderful and looks at the photolistings for us. We have inquired on 2 girls, one 11 and one 13 in which the CWs said they really did not have moderate to severe needs and they really would fit into almost any family. This would have been good news if we were selected. The frustration is that all of the other girls from 9-12 yrs old have had histories of RAD, severe ODD, physical aggression towards adults, fire-setting, & animal cruelty. Just wondering if we should go up a few yrs or keep looking for our age range? We are willing to adopt up to moderate emotional/behavioral needs except for a confirmed dx of RAD & physical aggression to adults and pets. Has anyone successfully adopted a girl in this range with more mild behavioral needs? We don't expect the child to have no special needs. Are there any other avenues that we should look at? changing agencies is PA?