I think that's the one thing that SC grads can agree with Longhorn fans about. Assuming it plays out as expected the Rose Bowl should be a very exciting game, and a low-scoring defensive struggle is the least likely outcome.
Vince Young can be an erratic passer, but he can also run for a touchdown on any play. Leinart is a better passer but not a breakaway runner.
Bush can score on any play when he has the ball, too, though, so it's likely to be a game where plays of 50 yds or more determine the outcome.
Texas can win the game, but they're going to come in as underdogs (not a bad thing from a psychological angle), and they'll have to overcome the fact that while the quarterbacks may offset, Texas doesn't have the equivalent of Reggie Bush.
Something definitely in Texas' favor is that USC has horrible special teams (especially the punt & kickoff return teams).