I am sorry the GMAT didn't go as you planned, I know that can be tough. Unfortunately, the truth is a late round application, low GMAT and a low GPA from CSU is a tough pill to swallow for a top tier school. Miracles happen but usually that takes a pretty stellar story and I do not see that in your above post yet. You can always prepare the applications, USC is probably your best bet, but it will be an uphill battle. My advice would be to work on those internet start-ups this year, MAYBE put in some applications knowing it may only be for practice and tackle it again next year. I think your GMAT and your experience will both be improved by taking another year.