Um, the Open then lots of daylight.
The other don't really count anymore given that global players no longer bother to come out to play unless they are well paid and that does nothing but diminish the whole event. The PGA tour has basically killed off everything - the giant vampire squid of the golfing world
The Australian was great when the Americans came out, or when Norman was in his prime, or even toward the end when it was still played on decent courses. But while it still has some provincial charm it has lost much of its cache. Sydney has purchased the rights forever in a sad attempt to be seen as a more sporty city than Melbourne, which means the choice of decent venues is limited to three, none of which will set the world afire.