With Bradman and Gilchrist in the team, I would make Miller bat at 6 and go with a 5 man attack. As I said, he will be my 3rd pacer only when Warne and O'Reilly will be together.
I get the consensus and I can see why, but I also think it boils down to how highly someone rates Grace, Ranji and especially Barnes. Imo, SA bowling is ahead as, Steyn=Barnes, Donald=Trueman, Pollock>Anderson, Procter>Laker, Faulkner=Grace, and Kallis>Hammond. But also, English batting is more ahead as among the Top 6 bats of both teams, England have all 6 imo and one of them isn't even making their team.