Basically, I reckon that Johnson should be the man. An attack with Tait, Lee and Clark is great on their day, and could destroy any batting line-up, but Lee and Tait are both prone to bowling rubbish and getting smashed at least once a series. If that happens, you have Clark, and who else can keep it tight with line and length? One bowler of their style is enough for me, and from what I've seen of Johnson, he's dependable and a wicket-taker, just like Clark. When Lee retires, which isn't that far away, then Tait should definitley come in for him.