I largely agree with anonymousegmat. Your quant score is good, but until your overall score is in the 700+ range, your odds at any school in the top 30 range are pretty low. In addition, you will need 3 recommendations for most programs, and a manager will not be a good choice. If at all possible, get ALL academics.
I will slightly disagree with him about MBA GPA, though. As an MBA, myself, I definitely agree that most of the classes are pretty easy; however, it tends not to be grade-inflated like most other graduate programs. My MBA program didn't have A-F grades or a GPA, but we were on a similar scale that ran from "No Credit" (NC) to "Distinction" (DS) that cannot be converted to a GPA. That being said, if you tried to convert my grades into a GPA of sorts, it would look pretty crappy, but not because of poor performance.
Why? Well, for one, we had many classes with optional final projects or papers. If you chose not to do them, the highest you would get in the course was a "Pass," which is right in the middle of our grade distribution, so you might be tempted to view it as a C. Some might say students taking this option were lazy or uncommitted, but in reality, taking the optional Pass in an easy course of no relevance to your intended career allowed you to focus on more analytically rigorous electives and their final projects. So for instance, in a global macro "perspectives" course that was largely just a very basic overview of how global economies work, there was a very detailed and rigorous final project that was optional. I chose not to do it, because I was taking the most rigorous electives we offered, and I had more important projects in those courses. Rather than write a paper on China's economy, I was able to focus on building a Monte Carlo-based inventory optimization tool in Excel for a Decision Modeling class, and I was also able to do some data mining and regressions on music sales to investigate whether social networking website metrics could be used to forecast album sales and came up with bundling strategies for another class. I got Distinctions in these courses, but just a Pass in my global macro perspectives course, even though I aced the midterm and final. So is that really a bad grade? Not in my mind, and not in my school's mind, which is why the transcripts specifically say our grades cannot be converted to GPAs. I think having this flexibility makes for a better learning experience.
So I don't know how adcoms will view low MBA GPAs. I think on the one hand, they understand situations like this, since they teach MBAs. On the other hand, if your low scores are in the RELEVANT courses, then that will probably be a problem. A sub-3.0 GPA in an MBA program with a C in stats is bad news.
Just my rambling two cents...