I think that LaKisha was the one to beat in the beginning. However, she rarely listened to the mentors, her song choice was poor, and I was sick of waiting for one of her mammoth breasts to fall out of her way too revealing outfits for a woman of her "stature".
Frankly, I think that Melinda, while the most talented, is the least marketable. Her style of dress is too old-fashioned (half the time she looks like she's dressed for the office) and I doubt that tweens would show up in droves to buy her CDs, which is the necessary goal in this competition.
I see Jordin or Blake as far more in the mold of an American Idol. However, I think that Jordin is more talented. Let's see who gets pimped by the judges next week. Then at least we'll know who THEY want to win.