SAP: Really wouldn't get into six sigma or SAP type certifications unless you are working in industry for a fortune 500 company & can leverage the training along with gaining experience. Audit doesn't really translate too well to this certification & any company looking for talent values experience over a certification any day.
CFA: wallstreetoasis & mergers&acquisitions are two forums/advice sites that give you an understanding of what the CFA can/won't do for your career. In all honesty, the main problem no one brings up when thinking of the CFA as a big 4 auditor is the 48 months experience. 90% of audit jobs won't count towards that requirement. You might get by if you audit Financial Services firms (Asset Management, broker dealers, ect.), but most likely that won't cut it b/c it has to be an analyst type role. Pricing funds, recalcing dividends/interest, and other audit tasks do not cut the mustard to performing DCFs, creating models, and valuing companies as a whole on the dtd.
Also, it's extremely difficult to segue from audit to front office analysts’ job. A back office job is not what people want when pursuing CFAs. 99% are looking for big ticket trader/analyst/broker gigs that pay the six figure salaries. Thus, you most likely need to make 2 or 3 job switches to get that position if you come from audit. Trust me, I know countless back office guys with CFAs that will never make the transition. It's very rare to go from audit to any type of analyst/trader/sales job as they're very different skill sets. You can try to transfer to TS or transfer pricing or consulting and then segues to private industry. However, this is still a crapshoot as well b/c it’s all about timing and a spot opening at the firm. So it's realistically a 5 to 7 year process to get the CFA experience requirement & that's if you pass all 3 parts during the job transitions.
I won't go into the exam as there's more than enough info out there. However, I will say the exam is probably 3 to 4 times the amount of study time than one puts into the CPA exam & much more difficult. Lastly, for someone not working in FS in any capacity, it's probably best to transfer or do a rotation in one of the aforementioned areas before jumping into the industry. It's hyper competitive and Big 4 audit hurts more than it helps.
Pros of CFA: Really means something in certain areas of the FS industry and can set you apart from others trying to break in. Shows you are smart and can put in the time to understand complex financial concepts. May lead to better opportunities down the road in FS, but won't get you a job right away. Overall, it's a sign that you are smarter than the average person in FS and kinda expected if you want to get to a certain level as a PM or in asset management.
Cons of CFA: Really only means something in the FS industry and means didly in most private sector jobs. Most industry executives do not value the certification because it's investment specific and doesn't relate to their industry. The time/money invested cannot be made up and the payoff is very uncertain. Overall, it only works if you network and make multiple career jumps to ensure the CFA is a logical part of your career path.
IT Audit: This is another area that might help, if you're truly interested in staying in audit. Your firm may pay for some of the certification. Depending upon your expertise, you could transfer to private industry IA more easily b/c an IT audit background is still very unique. However, this is a narrow certification that puts you in a certain niche in auditing that one should really enjoy before committing. Otherwise, it could be tough to find jobs that relate outside of auditing.
Here's a few basic certifications that you didn't mention that are viable opportunities.
CMA (Certified Managerial Accountant) – helpful in industry and respected as well. It is not as well known as the CPA, but could help you stay in more of an operations roll than doing IA, budgeting, or corporate accting.
CIA (Certified Internal Auditor) – This coupled with a CPA could lead to a very lucrative career path in internal audit for a mid-size or fortune 500 company. Not too many of these jobs out there, but it's easier to break in with Big 4 experience/CPA behind you. You'll see tons of Big 4 audit in these positions.
CFP (Certified Financial Planner) – probably the easiest one to get on this list. This is if you're interested in managing other people's money on a more personal basis. Can be a good job where you start your own business. CFA/CPA/CFP (or any combo of the 2) is rare and would really set one apart from the competition. Totally different than audit and much more sales focused.
Overall, you should figure out through linkedin, talking to others, and online research what you want your next steps to be. Planning on sticking with a firm until you hate it is asinine. It's very easy to do research to understand what jobs you do/don't want as your next steps. I came at you hard on the CFA b/c every tom, dick, and harry throws that out there even though they haven't worked a day in FS or understand what that certification actually can/can't do for them. Formulate a plan and utilize your resources to have a firm either pay/reimburse you to learn. If that's not possible, then pick the certifications that you are certain will aid you down the road rather than haphazardly investing in something that everyone says is a great investment (read law school or cfa) that will cost you time/money.