Nicki, Ant having Aspergers will be a fab fab fab thing for a child to grow up and understand so I agree with your thinking about it being an advantage. When matching parents, local authorities look for potential parents that can offer individual circumstances to the children so if you were to consider a child with Autism/aspergers Ant would be a fab positive role model, hell Im sure he would be even if they were neurotypical
We had plans but fate got in the way, we were looking into fostering when I fell pregnant with DS, I was going to be a surrogate when I fell pregnant with DD and we have always said when DS was older we would look at adoption.
Although the media portrays the fact that the authorities are being more picky, in actual fact they are getting better, hell only a few years ago single, gay and people with HIV would not have been considered AT ALL, but now it is the norm 8) .
My Hubby does befriending which is such a fab thing to do. He used to specialise in assisting parents of children on the autistic spectrum to manage severe challanging behaviour and from there got into befriending some of the kids he met. The way that works is either DH on his own or us as a family (DS included) would have a set time and day to take a child out and let them be who they want to be so if they had an obsession with trains we would go sit on a train station platform for the day or go to a park with a ball or going to the local youth group. Mainly it was so the kids and parents go a break. I really enjoyed doing this but we had to stop when I got poorley in pregnancy, DH still does it with a couple of kids on his own and really loves it. We have some fantastic friends now from doing this and my childminder is a good friend we met via doing this (DH would get her son up everydayy for school for a year). You get paid for your time and expenses (not that that is what you do it for) and I think if you get benefits the money doesnt get taken into account as is not an income as such. At one point 2 years ago DH didnt have a 'proper job' just lots of regular contacts with kids and it was a really rewarding time for him and us (although I was jelous he got paid to play and have fun all day!!).
Good luck with it Hun you will be fab at it!!