Accountancy, like any professional qualification, is always a valuable asset to have on your CV.
I work in Investment Banking and noticed that virtually all the senior mgt personnel (MD, Heads of Dept) were either certified or chartered a/cs. So I went ahead and did the ACCA, which work paid for.
I already have a MBS so got several exemptions and got all the exams done in 2 years - it's worth looking into (
www.accaglobal.com) to see what you might be eligible for.
While it's not directly relevant to my job (treasury mgt) it is usually a given for other departments of Banking - e.g. Credit analysis which usually is the stepping stone for Asset/Portfolio Management.
I'm not sure how much flexibility there is in other industries but at least with a/c you get a much better overview of the entire business than you would from being in the HR/Marketing depts - the concern would be that you might not be able to get out!
Of course, working for one of the big A/C firms is also an option - and it's not all audits/year end stuff. Most of them are active on the consultancy side which is much more interesting - so you won't just be adding up balance sheets all day!