Well, the MBA is usually not worth it. Preface: I mean no disrespect, and I know that it's fascist and superficial, but the fact of the matter is that in our profession the name of the school attended is THE defining factor. The actual education value may end after the interview and job offer, but it is an undeniable fact.
I mentioned the Executive MBA because you just want the path of least resistance with the least financial pain possible. IMO, the top-ten business school mantra is simply a filter or screening device used by lazy personnel executives, but the effect is undeniable and it is what it is, neither one of us decided that's the way things should be.
Here's what you do: take an inordinate amount of time and way overstudy for the GMAT. Go ahead and buy the prep classes, whatever it takes. Kill the GMAT. A great GMAT score and your experience will trump the undergrad creds the other applicants are bringing to the table.
And I know it sux, but get accepted to the best schools first and worry about paying for it later. Top three is a ticket with your experience.