Hm... I think USC beats Texas straight-up. I know SC doesn't have a great pass defense like last season, but they are decent and Texas isn't too great of a pass threat anyhow. I think they would be able to contain Vince and Selvin Young to a reasonable amount as well. As for USC's offense vs. the Texas defense, THAT should be a matchup for the ages.
But, I don't really care which order they are in because #1 and #2 will be playing eachother at the year's end anyhow.