2003 and 2007 sides were the best two. Personally I preferred the 2007 side (just), you had the electric pace of Tait and Lee, the control of McGrath, then the spin of Hogg.
Still think the 2015 side is good without being great, with Starc practically carrying a pretty average attack half the time, and Steve Smith carrying our batting.
How soon we forget: Brett Lee didn't play in 2007 World Cup. Nathan Bracken, Tait and McGrath were the front line pacemen.