Tigers - Rabbitohs - Roosters
It looks as though one of these teams will take out 8th spot. The Roosters are in great form, and need to win all their remaining 3 matches. Souths have to beat the Tigers, and Roosters. The Tigers have to beat Souths and win one other (unless the Roosters win all remaining 3).
Brisbane could also fall out if they lose 2 of their last 3. But it's mkore than likely it will come down to one of these 3 that will grab 8th spot.
Anyway, as much as it pains me to say it, I don't think Souths will make it. I think The Roosters will do it IF they beat The Titans this weekend.