Is the purpose of your self-study to prepare for organic chemistry class or to prepare for the MCAT?
I took the MCAT prior to taking any organic chem in the classroom, and used a one-semester organic book by Solomon (or was it by Brown? ... I will have to check on that) as well as the Kaplan MCAT book. Having now read a one-year organic book, I can confidently say that a good one-semester book will be more effective if you plan to take the MCAT in August.
If you are hoping to get a good jump on the classroom organic, I would still recommend a one-semester book over a two semester book. But in this case, the "Pushing Electrons" book might be a better use of your time.