We've adopted transracially three times in the last three years. And we've been delighted with how well things have gone for us so far. I have to tell you, you may well be surprised just how well family can accept the fact that you're making what you believe to be the right decision for you (not that they'll necessarily agree with it or would have wanted to do it themselves).
We know that both sides of our family can be at least somewhat racist. My husband's uncle, in particular, can be ridiculously overt about his racism. Anyway, last Christmas, we were visiting, and he commented to us about how genuinely happy our kids seemed. Clearly, this uncle wouldn't have wanted to adopt our kids (we know we're not bringing miracles about!), but it was a really remarkable thing for him to say. And we felt we at least made a little difference in the way he perceives people of color.
But, you also have to seriously consider whether you're comfortable immediately becoming a conspicuous family. (For more information, see
Adoption Learning Partners) Are you ok with the idea that people will always know that you adopted because your child looks nothing like you? Are you willing to accept the additional responsibility of raising a child whose ethnic background you don't share? For us, these were challenges we felt comfortable taking on. But the fact is, we're raising children who will be viewed in society in a different way than we are...and we've got to prepare them for that.
Ok. I've probably already written too much...but these were just some of the first thoughts that popped into my mind.
Good luck! I hope that this is the start of a journey that will bring about much happiness for all of you...