My opinion is that American (aka young girls) will be making the mos calls. Therefore the cute guy, Adam who looks like an Anime cartoon character will be the top pick. He's a great singer, confident on stage, and has great control of his voice. It's obvious why he was put on last.
As for the guys, I'm with Brian on the Nick/Norman choice. I think he'll make it far because he is the MOST entertaining, but he won't be the finalist. He brings a freshness to the show and it's obvious people like him.

As for the girls, this one was really tough. There were three that stood out to me - Jesse (Bette Davis eyes) I liked the best. She sang and phrased well, and had comfortable stage presence. She had a personality when she wasn't singing that I liked too. Allison Iraheta was dynomite powerhouse covering Heart but seems a bit whifty. I also liked the tonality of Megan Corkrey, though not the best song choice. Her stage presence seemed a bit nervous. Mishovanna moved well and sang well, but it wasn't memorable for me. Though she was good, there wasn't anything unique that stood out to me with her performance.

I'll bet America will vote for Adam, Allison, and I hope Nick.