Well as for the compeition level with Pac-10 vs. Big 12 this season...
How could you not go with the Pac-10? Sure our defense sucks, but we play a lot of good offense (I still maintain that even the worst starter would be among the best QB's in the SEC or ACC) whereas the Big 12 just sucks all-around. Outside of Texas, what is there? Stoops is trying to fit the pieces back together at Oklahoma, and Texas Tech is irratic.
I forget who said it earlier in the thread, but when you force Vince Young to sit in the pocket and make decisions, he doesn't do very well. Texas A&M proved this. He was limited to just 19 rushing yards on 11 attempts and was forced to throw a decent number of times. What happened to him? He made just one more than 50% of his throws with one TD and one pick. Against Ohio State, he was 18 of 29 with two TD's and two picks. Not horrible by any standards but certainly not even close to good enough to maintain a shootout with USC. The Trojans defense, while down from last year, I believe is probably better than Texas A&M's. Contain Vince Young and Texas' offense is easily stoppable.
I'm going with USC.