Well being a Giants fan, I think the Giants will win the game.

The defense is alright, and I think will be able to stop the Cowboy's offensive attack. The d-line especially really stepped up against the Seahawks last week I thought. And their offense is hit and miss. Eli Manning is going to have to have a big game for them to win, but I think Plaxico Burrress will be able to get open against the Dallas secondary. I think its going to be a great game, but the Giants will pull it out, 17-13.
About the Seahawks and Panthers beating either team in the playoffs, I think that is a very bold statement to make. I was very unimpressed with the Seahawks in their victory over their Giants. Matt Hasslebeck choked under the pressure of a regular season game, and has choked in past years in the playoffs. Shawn Alexander is a great back, but he can be stopped, and when he is, the offense basically falls apart. I haven't seen the Panthers as much, but they are beatable, and not a sure win against either the Giants or Cowboys.