You could accept the spring admission at UCB, attend a community college in the fall (allowed according to http://admissions.berkeley.edu/januarystart ), and then reconsider whether you want to go start UCB in the spring or stay at the community college and hope to transfer to USC. Or go to UCB and, if you do not like it, try to transfer to USC. Or go to UCB, and send a transfer application to USC as well as apply to business in your second year.
How do costs compare and how important are they to you?