I reckon the tri-series between Australia/Sri Lanka/England will give us a better indication of what Australia's best ODI team will be ahead of the World Cup.
For what it's worth, my best XI would be:
Warner, Finch, Watson, Clarke, Smith, M. Marsh, Haddin, Faulkner, Johnson, Starc, Harris.
George Bailey would be my 12th man and could be included when the batting needs strengthening.
I can't find a spot for Maxwell, Doherty, Cummins, Coulter-Nile or Hazlewood in my first choice team.