One of the most important things as an auditor is to participate in continuing education. It's not unimportant as an accountant either.
I've come to the point where I need to get something more. I have a few choices, but I'm having trouble focusing on one thing.
MBA - I could get one in Accounting or Marketing. Accounting would probably be more useful, but Marketing might be easier. If I did, I pretty much know where I would apply. I'd need people to write me letters of recommendation and my former company won't let people do that, so it's an issue. I'd also need to get a good score on the GMAT. I'm studying for that, but am trying not to psyche myself out. I hope it would be useful, but I already have an odd education/experience mix.
ARe - Associates in Reinsurance. This is an insurance industry designation that I'm over 60% completed. I'd like to get it finished just to have it. It's a little unusual so I think that would pay off - but what if I never go back to the insurance industry.
CPA - A lot of work to study for the test, but probably something that everyone recognizes and I don't know if there's an accounting/auditing job where it wouldn't help.
CIA - Pretty much the same as a CPA, but certified internal auditor. Equally as prestigious though less well known.
CFE - Certified Fraud Examiner - not really a must have, but useful in auditing, and I hear one of the easier to get.