I have not taken any classes at NYU, but I would not recommend that you switch to their postbacc program. First of all, it is almost unknown, even in the NY area. (The two name programs in NYC are Columbia and Hunter; the others have very little name recognition.) The only person I've ever met from the NYU postbacc didn't get into med school, and was doing a master's in an attempt to help his application.
Second, like all private postbacc programs, it is very expensive. I went to Columbia, which charges $1210 per credit, and I would expect NYU to be similar. There's no reason to pay that kind of money when the education is pretty much identical at NYU and Brooklyn College.
The only real benefit of a postbacc program, whether private or public, is that they write you a committee letter. This is a composite recommendation letter which quotes from your faculty letters and gives med schools some additional color about you, such as your personal interests and where you rank in the postbacc class. The other aspects of postbacc, such as advising and linkage programs, are way overrated. I have NEVER met a premed who thought their adviser had a clue, and I can tell you for a fact that the Columbia advisers are useless. As for linkage programs, pretty much all postbacc programs have them (including Columbia and Hunter), but the dirty secret is that very few students actually end up linking. (At Columbia, a program with several hundred students, it was probably less than a dozen people per year.) The reason is that the requirements are quite arduous, with GPA minimums (often 3.6+ BCPM) that are often higher than the grades of students who are accepted in the normal application cycle. Plus, you must do everything months earlier: the app deadline is December, and you must take the MCAT by May. Often, you are much better off applying in the normal cycle, when you can take longer to work on your application and have another semester's worth of grades to help your GPA.
If you are dead set on a formal postbacc program, I would recommend Hunter (and ONLY Hunter). The cost is reasonable and they have a good reputation with med schools. Yes, it's a city school and there are hassles that come with that, but you'd be surprised how many of those same hassles I experienced at Columbia with its $58,000 price tag.
