I really believe Simic has to be on the field. Having him nullifies any teams big strikers. He is that good of a man marker. Therefore I voted for him, and all the while frees up Jarni to take a more of an attack position. Rapa will be the odd man out.
I like jarni and his speed on the left side. He can utilize it to make his famous overlapping runs...just like he did for that goal against Germany in 98. He may be a bit older, and may have lost a step, but even now he can run with the best of them.
Unless, you'd want to move him up to the midfield and that would be fine too.
Simic because that is the only place where he can play. With R Kovac on the right side of defence and Tudor in the middle it would complete a world class defence. Jarni and Rapajic are wingers. I think that soon Ante Seric and Simunic will be making claims for a place in the team. Two Aussies!!