C.W.
I love the question because I have often pondered it myself...I am a corporate woman (only 28) and the breadwinner of our household. I often find myself wondering "what am I doing??" I have a 2 yr old at home and hope to add another very soon. But when it comes down to it...this is whats best for OUR family.
My opinion...with a possible divorce in your future, I would say go coorporate. Purely for the stability. I say this only if you will make plenty of money to not have to worry about finances. If it will border line just pay the bills, then maybe you should go the childcare route. Also, something to keep in mind. If you decide to pull out of the corporate world right now, know that it will be very difficult to get back in simply because you wont be "fresh"" anymore. I hear this to be a big complaint from people who choose to walk away.
So I think you need weigh the pros and cons...literally on a piece of paper and I think you will get a lot of clarity. I agree with others who have said there are pluses and minuses of both options. I know this was likely no help to you, other than just to tell you that you are so not alone. Many working mommas go through this same internal battle everyday.
You are a good mom for even pondering the idea...keep up the good work : - ) And good luck with whatever you decide!