I just came from a game against the army my brother is bringing to 'Ard Boyz...
The list is here if you want to take a look
http://www.40konline.com/index.php?topic=185733.0Anyway. We got the HeadHunter mission. A Warboss tucked in the middle of a Nob Biker unit is very hard to kill. *very*.
The Mek was hidden inside a unit of boyz. I only managed to get into CC with his unit at turn 5. By turn 6, it had taken 1 wound. There were simply so many boys to plow through that i didnt manage to get to him in time to score a kill. Even with a unit of berserkers.
Since every scenario is a variation of Kill Points somehow, i believe Orks is one of the best armies for the tourney. On armies like my brother's, it is so much work to get each KP that it is very frustrating. The easiest KPs to be gotten there are the lootas, 12 boy units that are hidden behind a mass of boyz. After you take out the lootas, you have to choose between 30 boy units or nob biker squad of doom -_-".
Either way, my point was: bring both HQs. If they are tucked in the middle of the units they should be leading, it will be fairly hard to get to them.