I'm all aboard the Hogg bandwagon as well. He's been bamboozling them in the Big Bash and would probably be even more effective on Sub-continent pitches, where the tournament will be. He seems to get low bounce now (but with lots of spin), as he's so short, so on those pitches it would bounce even less and I imagine would be harder to get away, while probably spinning more.
He looks to be clearly our best option right now and has been more economical than Warne and if he plays in the IPL and has success there, I'd be even more happy to have him play for us in the World T20. Why the hell not! Who cares about age? Lets live now!
White has been in terrible form for almost 12 months now, so unless it improves dramatically by then, we need to find another option to captain the side. If Watson is there, he could do it, otherwise I guess the best option for the moment would be David Hussey, who has captained plenty of times for Victoria and has played more T20 matches than possibly anyone on the planet, in all sorts of conditions.
If Watson doesn't play, I'd rather see Ronny McDonald (or maybe Faulkner) play the "bowling all rounder" role, than Dan Christian, as his bowling is better I reckon and his terrific slower balls would be highly effective on those pitches. McDonald also has a surprisingly outstanding batting average in T20's (35, from 74 matches, top score of 96*), compared to Christian, who has also played 74 matches, but averages just 18 (not sure where they've both been coming in through their careers, though and I imagine Dan has a better strike rate- they don't have one listed for Ronny on Cricinfo). They both average mid 20's with the ball and go for about 8 an over and get a wicket every 18/19 balls, with McDonald's figures slightly better in all 3 regards. He doesn't hit the ball as far as Christian, but on those small grounds, he wouldn't have to. You get the same 6 runs if you just clear the boundary as you get if you clear it by 20 rows.
Then again, they will probably play Mitch Marsh ahead of both of them. He played in Australia's last T20 game and I imagine they will pick him again in the coming T20's V India, as they'll want to continue to fast-track his development. In his 50 the other night he was just easing the ball over the rope for 6 (4 of them) and he could do that again on the Sri Lankan grounds. He wouldn't even have to hit them hard to hit sixes there.