Mercedes and Shandi, without a doubt. I was hoping that I was wrong about mercedes having lupus...*sigh* If they kick her off the show because of that, I'm going to be pissed off!
Not only that, but Shandi is trying so hard....I'll be mad if she got the gate too! As a matter of fact, I'll be mad if it's ANY of them (except Catie).
Catie would probably be my fav to go. The rest of them I really like for different reasons, and it would be really hard to pick anyone after Catie.