Hi Arturo, congrats on all the work you've been doing towards your MBA admissions! It sounds like you're very motivated, which is so important.
Without knowing the exact reasons behind your wish to start in NYC in January, I can still offer an additional school to consider: the NYU Part-Time program has multiple session starts, including one in the Spring. As I'm sure you know, NYU is competitive with Columbia for attracting top-notch candidates, though the part-time program has a different profile of students than their F/T one (usually a bit older, and not changing careers).
Perhaps a review of your essays is all that you need (see here for details on this service: http://www.veritasprep.com/mba/essay-editing-details
). However, my guess is that even though you're well down the path with your applications, you might benefit from a Diagnostic Session, which is a candid discussion with an expert about how you've positioned yourself in your applications (US$350). (Unfortunately you've just missed our MBA Admissions Blueprint in New York which would've been ideal!)
I'd recommend that you give us a call at 1-310-456-8716 to discuss options. I'm sure we can find a way to help you out.