Is continuing to work at your present company an option, if you don't get an MBA? Or do you even want to stay at your company (if you can get out of M&A)? That's probably the first question I would ask.
If you want to stay, then consider part-time programs wherever you are located (I'm not sure where you are). If you want to switch careers (or at least switch companies, or maybe move to a new place), then go full-time. It sounds like you still want to do finance, even if it's not M&A, so I'd recommend looking at the strongest finance-related schools: Wharton, Columbia, Chicago, Stern. Also consider a lesser-known school such as Indiana or Rochester.
I'm not sure what else to tell you in terms of deciding what you want to do, other than ordering brochures from these schools and seeing where their grads tend to end up. That might giv you some career ideas.
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