Should I Get a Master's in Accounting or is a Graduate Certificate in Accounting Sufficient?

Situation: I have a BA in Economics and an MBA with a concentration in Marketing. I've been working in research for the past four years (market research/social science research) and haven't been happy with the work, career growth, or future prospects. I had always considered going for accounting and tried getting into the accounting program for undergrad, but couldn't get in because it was highly competitive (and I'm not dumb – I was in the Honors program). So I did the MBA one year after undergrad in marketing with an interest in marketing strategy and research. As I said, I haven't been happy and future job prospects in market research/strategy are not as plentiful in my city as say NYC. So, I've decided I want to go the accounting route – I feel like it's a safer industry with a lot of job opportunities, good pay, and the work is more black and white unlike market research. Plus I worked in an accounting department before (pre-MBA/internship) – so it's not totally new to me. So, my question is that I have an MBA, so I only have to take 6 classes in my state to sit for the CPA exam (although I'm taking 8 because of prerequisite classes). Does anyone have any opinions on whether I really need to go for the Master's in Accounting or is a Graduate Certificate in Accounting sufficient since I already have an MBA? How am I going to look to employers as a candidate coming out with a certificate versus the Master's? I get a benefit through my employer that makes the certificate option really affordable. The Master's would be more money and I would have to travel for the classes (most online options require an undergraduate degree in accounting), but if I have trouble getting a job after finishing the certificate it may be worth the money and effort for the Master's, but if I pass the CPA exam does it matter. Any thoughts from someone in the industry?

Suggestion:

Honestly, the CPA credential combined with your MBA is going to make you very attractive to firms and should be more than sufficient for your career goals. A Master's in Accounting doesn't sound necessary for your situation. I'm not against higher education, but it sounds like you're set with your current plan. Plus, the salary comparison for CPAs vs non-CPAs: http://www.rogercpareview.com/become-a-cpa-your-career.cfm