Judging by current standings, I'd be taking
McGrath (availability pending)
Lee - A good long rest and plenty of time to practice Wasim Akram's advice should see 06-07 as Lee's greatest season of cricket to date.
Bracken - if they can put blind faith in Stuart Clark, they can give a little more credit to this guy. He's a dangerous player in First Class cricket, an emerging star in the ODIs and while his Test record is unenviable, all it lacks is a couple of wickets.
Gillespie - I'd still rather Bracken than Gillespie, just because of variety's sake, but all things considered they should decide who gets the spot by single combat.
Tait - Gets the backup postion ahead of Clark, who would probably be a good fourth quick, but nowhere near as exciting. Tait would probably jump ahead of Gillespie in the ODI squad too.