karbea, when we were ringing round prospective agencies we were treated very rudely by one, who basically slagged me off for daring to presume I could parent a mixed heritage child (this was the NCH Black Families Project, which presumably deals with quite a lot of interracial couples, which is what we are). I was also rejected by my home LA who don't place in borough. And by another agency because we weren't white enough - and they only had white children on their books. However, the last did give me loads of really useful advice, especially that I needed to understand adoption as a marketplace. Agencies know, pretty much, the children they have coming up and recruit against that. They don't want to waste money approving adopters who they won't use. But that doesn't mean there won't be an agency who won't want you.
Now, I was lucky enough to be in London, which has a huge choice of agencies. In the end I went with the one where the ethnic demographic mirrored us, where the social workers were keen on us and the staff were friendly and efficient. And they were fantastic. (STill couldn't find us a match, though - in the end we found our dd via the National Adoption Register.)
So you basically need to ring every agency within an hour's travel of your home. And see if talking to them helps you and your dh to move forward in deciding what you want to do.
I completely recognise what you're saying about the offputting information evening. I remember ours with a bit of a shudder: we got eaten alive by the social workers, who were very very keen to have us (or rather my Caribbean dp!) but as we walked out we passed a white woman who was in tears, saying, "I just want a child to love and care for, and you're telling me I can't because I'm white". I really felt for her, but since then the requirement for ethnic matching has been relaxed and in addition there are many more children needing adoption, I expect this immediate ruling out of white people shouldn't be happening any more. (Besides which: South Bucks?? Surely most of the children there are white?)
I don't know the answer to this issue about frightening adopters off by giving them the worst case scenario. I kind of can't make sense of it in my own head. On the one hand, people do need to know that this isn't just like having a birth child, that love is not always enough, and that pretty much all adopted children will have extra issues and challenges. ON the other hand, it's simply not true that most adopters are enduring a living hell. My daughter is certainly challenging and has extra issues, and some days I feel down about that, but she's also lovely and loving and we have a great family life. I truly don't know what would be an accurate way of conveying the range and complexity of experience on this, though.
I agree with others who have said that it is an advantage to have a SAHP going into adoption. I'm really surprised that you were told it should be 50:50 - when we went to matching panel, they were quite perturbed that we were both going to be around (me on adoption leave, dp working from home) and questioned who would be the primary carer - they worried that the child shouldn't have to attach to two people at the same time, easier to have one primary attachment. I do wonder if they might have been concerned that adoption was basically your project, and wanted to ensure your dh was 50:50 involved for the assessment process and equally emotionally committed? Rather than implying that he should be doing childcare 50:50?