Let me add my two cents.
USC's PBL curriculum is great. There is nothing wrong with this type of learning other than the fact that some students would rather sit in a lecture than work in a small group. I think, if you can see yourself in this type of environment, you will be very happy with your choice; however, the nice thing is that USC has integrated some lectures back into its curriculum for courses that are best suited for this such as Gross Anatomy, Local Anesthesia, Amalgam, Composite, etc. Cost is a major factor, and I'm not going to lie to you--it is a lot of money. But, if being close to your family is important to you than it might not be so bad. Also, the clinic will undergo a 4.3 million dollar renovation starting May of 2008 - June of 2009, which will offer all of the latest technology.
One last note, Typodont is not exaggerating about the graduation rates, I think we all know what they are by now; however, I can tell you first hand (trust me, I know what is going on), that the issues the class of 2007 faced and the class of 2008 are facing right now are slowly being resolved. I strongly feel that the class of 2011 & 2012 will be graduating on time and moving on with their lives.
Good luck with your decision.
P.S. I had other schools to choose from as did many of my classmates. My classmates opted for USC over Columbia, MCG, Pitt., Indiana, UoP, ASDoH, San Antonio, etc.