Thought I'd register here to say, first, well done on the fundraiser - glad it's gone so well .
I'd be careful here - don't forget the Simon-Ehrlich Wager when it comes to things like the oil price. All this fracking (to say nothing of the potential of Libyan/Iraqi/Iranian oil) will act to push the price down. Obviously you can't predict what future oil shocks etc there will be (also, what'll Iranian oil exports be like in 2 years? Who knows), but Malthusian ideas have always ended up wrong since... well certainly the 2nd Century AD, when Tertullian (a Carthaginian) was whining about the inability of the world to support a colossal ~190M people .
One thing I'd definitely look into, regardless of what you actually end up speculating in, is automated trading (of which I've had some experience for FOREX markets). If you or someone you know can write a program to buy/sell stocks / currencies / whatever, then go for that instead of relying on a human being to make the call. Software like MetaTrader can be used to test & monitor it - so design the trading program, test it on MT4 or MT5 using historical data, and if it does well using lots of historical data & realistic conditions (ie, don't forget brokers' fees, taxes etc!), try using it for real.