I voted only for the David Wirrpanda Foundation because Heath supported it during his lifetime, because it has offices in Perth, Australia, Heath's birthplace, and, as silly as it may sound, because David Wirrpanda took the time to attend Heath's memorial service in Perth. Heath loved Australia; it was his real home, not SoHo, Brooklyn, or L.A. And I can't help feeling that if Heath had spent more time in Perth, things might have turned out differently for him.
I don't know if we are planning to notify his family of our donation, but if we are, I feel it would be more meaningful to them if a donation was made to a charity they are familiar with. (And a Perth-based charity would know how to notify his family.)
That said, all of the charities listed are for worthwhile causes, and any of the others would make a fine choice, too.