Just my 2 cents on the donation,
in all honesty, I think Heath would be fine with whatever choice we make... certainly never knew him personally, but he seemed to me such a genuine person, I don't think he would begrudge any heartfelt, genuine choice... I guess what I am trying to say, is I don't think we need to worry about doing specifically what Heath would want. I think that if what feels right to us, is supporting a charity a Heath supported, or supporting children in his native country, or supporting arts-based organization, then that should be fine. I personally think Heath would support any gesture of goodwill.
Hopefully that makes sense, and doesn't come across as argumentative...