Great job, steelish! I can't disagree with any of these, except maybe #7, the diplomacy one. Seems to me a silly reason for anything, trying to show up your neighbor.
I would probably place #5 and #4 at the top of my list, with #10 linked to #4. The whole reason for colonizing would be to spread the human race out so that it could survive a cataclysmic impact of the Earth.
For those interested in such, I highly recommend Phil Plait's book "Death From the Skies" which lists a lot of the stuff out there that is capable of destroying our culture, our civilization or even the whole planet, not least of which is our own Sun. It wouldn't hurt to have a few colonies further out than we are.