Personally, the side I would have picked would have been:
Warner
Hughes
Khawaja
Ponting (Lucky to hang on, mainly only because of injuries)
Clarke
Hussey
Haddin (In normal circumstances would have preferred Wade, but with so many debutants, would probably be better with Haddin staying on + he did ok in his last innings)
Butterworth (excellent overall record, excellent recent form, adds a lot with the bat and simply deserves a go)
Copeland (simply didn't deserve to not be given another chance, enough has been said about him)
Siddle (like Ponting, lucky to hang on, but mainly only because of injuries)
Lyon
Could argue that having Butterworth and Copeland in the side lacks penetration, but the reality is alternatives like Starc haven't even been 'penetrating' at shield level so far let alone a step up. Plus more importantly, with the supposedly new regime good performance HAS to be rewarded over whims about potential or biases to do with how fast someone bowls.
If the third bowler has to have been chosen from the A game, then I'd go with Pattinson. Just looks a better and more polished bowler than the rest on offer, performed the best in the match and has a pretty good record overall so far. Plus I think he has far more potential to improve and be a long term member of the squad over someone like Cutting.