I agree lehmann definitely was very underused in the test arena unfortunately. However, i do remember him saying in an interview he wouldn't be making a test return or something like that?
Anyway, the team is fine as it is, if anything, i reckon clarke's place is interchangable. Maybe put macgill in there if it's spin friendly, and if not, keep clarke in there?
Also, IMHO Clark (stuart) definitely needs to play, he's already taken 28 wickets at 17 and has shown he can do a bit with the bat.
Watson isnt really needed (but he's probably the most potent all rounder australia's got)....anyway he's still got that injury doesn't he?