I absolutely rate Gillespie and can certainly understand the argument to have him in instead of Harris. Lee was never quite at these guys level in tests, ODI though he is undoubtedly one of our best ever. For me, Johnno has to be there for his point of difference with the left arm and ability to destroy when he was on. I picked Harry over Dizzy based on gut feel, plus Harry was a more than decent bat too, but then so was Dizzy the double centurion night watchman. He'd definitely be the 12th man, unless we are going for a fieldsman, then Symmo is in!
As for Waugh, yeah certainly should be in there upon consideration. Problem is, Clarke was useless anywhere other than 5 and I love Smith's versatility. So toss it up between Smith and Clarke because when Clarke was at his pre-stuffed back best, he was an absolute joy to watch in all conditions. We've been very privileged with some great players and so many good fieldsmen in there too: Ponting, Hussey, Clarke (pre-stuffed back), Symonds, Warner, Lee, Johnson, Warne (in the slips) and Smith.