Yea Broad would be the one who *should* go. Finn, Anderson, Bresnan, Swann and Tredwell as the bowling attack.
If ever there's a time to play two off-spinners it is against Australia. I don't think England have enough control when they pick their 4 seamers. If a team gets going then there is Swann to slow the pace, make the batsmen work for runs - he can't bowl at both ends.