Out-of-context quote of the day:
"...although even $10 trillion isn't a huge amount of money..."
From Simon Johnson, Director of the IMF's Research Department, on "The Rise of Sovereign Wealth Funds".
So if you had $10 trillion, what would you do with it?
I would do meetings with the most bayesian/utilitarian/imaginative/brilliant and cultivated people I can think of, asking them to invite whoever they think could be useful.
We would first discuss about what would be the best decision making process for the group; surely every decision could be made either by consensus or by vote.
Then we would take action.