Dazed, I have no experience nor advice that I can pass on but I just wanted to tell you that your post made me cry. If your DW is as loving a person as what you are (and I'm sure she is), then I couldn't imagine more wonderful parents to be. I truly hope that you do decide to go down this path as there are some beautiful children out there ready to be so dearly cherished and loved as I'm sure you could both provide.

If the Aussie adopted child path is too lengthy perhaps you could look at overseas adoption?