I don't think there will be many performances remaining in this test to change the XI.
Here's my Ashes XI, and there aren't many Aussies:
2. Strauss (c)
A few tough selections. The first was Strauss over Watson. Watson, probably has been more consistent and has two half centuries, but so does Strauss who also has a century. So in the end he has to get the nod.
The other tough selection was Haddin. He probably hasn't kept as well as Prior, but he has batted much better. Haddin's innings in Brisbane was fabulous, he also batted well in Perth.
Only two Australian bowlers average under 30 so it wasn't hard to decide the bowlers. Siddle had to be in, despite only getting one wicket in two tests, in Brisbane and Melbourne he bowled super. Anderson & Tremlett were easy choices, and the other decision was between Swann and Johnson, both have bowled their teams to victory, however, in the matches they didn't Swann has easily bowled better than Johnson.