Watson looks better as an opener, seems to really struggle with the ball reversing, which he will get at #6.
His bowling is ok, but you know his body is fragile anyway, so if this reent form is a trueish indication of his ability, he's worth more to the team as an opener who sometimes bowls, rather than requiring a full bowling load from him and risking injury.
North just looks like a decent first class player really, nothing more....
In reality Aust has huge issues, struggling to beat teams like the Windies and Pakistan at home is not a great sign - while both those teams have some super talent, they both are on a par with NZ, and very much in the second tier of test teams... at their present level of performance so too are Aust.
Aside from the openers and Hussey despite the criticism have looked good.
Ponting and Clarke are definitely world class, but both struggling.
North and Hughes are not at the level that Aust has demanded in recent years - North never will be, and Hughes just looks like he needs more experience - he'd be the one I'd be tempted to use at #6 if a change is demanded - he certainly cannot unseat Watson or Katich
Haddin's record is excellent, but he was ill-disciplined in Sydney, and unlike Umar Akmal can't use inexperience as an excuse
Bollinger is having a good season, but not sure he's as good as all that. Johnson is a trier, and takes wickets, but until he bowls fewere bad balls will continue to be expensive, and good teams should take toll of him. Siddle is just not very good, and Hauritz isn't either, but he is taking wickets at the moment