If its not Vettori then it will be O'Brien (for NZs wickets). Martin has never been much chop outside of NZ or SA, where he has a crazy amount of wickets. Mills is lethal with the new ball (provided he has some form, which he doesn't) but until it begins to start reversing he is ineffective in between the two periods.
O'Brien can bowl with the new ball, the old ball, with the wind, into the wind. Has a good line and length and can get some movement. At one stage he did earn himself the name of O'Diren (much to the displeasure of Heath) because he was woeful at the top level, and in fact I'd still keep him away from ODIs, however finally he looks to be proving that FC record and not doing a Sinclair i.e. all the potential is there, but its gone walking someplace else. I'm not saying he's home and hosed, but he has the ability to be a good bowler at test level imo (boy I've done a roundabout on my opinion of the guy in the last few months, but he is a guy that for some reason I love seeing succeed)
Picking Lee or Clark to have most wickets for Aus. Krejza (sic), Johnson, and Watson aren't much chop, though we'll find ways to gift them our wickets no doubt.