My SIL adopted though DHS and it was a distant family relation but botton line , my neice has physical health issues and because she was in 3 foster homes before she was adopted at the age of 4. Needless to say she was not potty trained (none of the foster parents thought about it... she was a low maintenance child..and they didn't think about it.. it took them almost 3 years to get her trained not to mention the learning problems she has. She will be 11 this summer but only at 2nd grade learning level.
Another friend of mine adopted internationally and it cost them $20K or more... they had one baby lined up but at the last moment, the government wouldn't allow the adoption to go through...it was heart breaking... they had a good adoption lawyer and about a year later, they got a very active/bright son. I will be working with him in Awana Club this coming Fall..
Just research it out thoroughly before you decide and also, it's not jut YOU and your husbands decision... your sons are also a major deciding factor... you may have them work with you in a foster care area where the are other children like them and they can learn to understand that you have enough love for them and other kids too and not feel threatened...