S.T.
If you have the opportunity to be a SAHM in the future run, don't walk to that opportunity. There are so, so, so many volunteer opportunities at school church, local hospitals & other non-profits, etc - expecially for an accountant - that you would still be able to keep your hand in your career and maintain your identity. And you can be doing something that adds value to society.
Here's the thing - as your kids grow up and get to be school aged there's sports, music, clubs like girl/boy scouts, activities at church, etc. You will want to be involved and you'll want them to be involved. You'll also want them to be closer to extended family. Having grandparents, aunts, uncles & cousins close by is a wonderful thing for kids - it give them this extra level of love & secuity. It provides depth in their relationships and learning about life. It's such a benefit not only for your kids, but for you and your extended family. What a blessing.
Ultimatley, you have one shot at raising your kids. The years go by so very fast. My kids are almost 12 & almost 15. I don't know what happened becuase they were in kindergarten and preschool last time I looked. I've been able to work part-time since my oldest was in 1st grade - so for the most part when they're in school I'm at the office. It has been wonderful to be the one who picks them up after school and hears about their day - instead of a babysitter. It's great to be the one who makes it to every game, to volunteer at youth group, to help coach soccer (I had to go online and learn about soccer...!).
If you continue to work full time you may get to a point in your life where you'll regret spending so much time at work (you may not - some moms don't). But chances are you wouldn't regret being there at the end of the school day and watch your dear child skip down the sidewalk with the pixar backpack - which, as the years go by turns into a camo backpack and eventually a string backpack and an attitude - and they're not skipping (but that's kind of expected too). :o)
Now that my kids are in middle & high school they need me more than ever before. They may disappear to their room or finished basement after school / practice - but when they resurface and sit at the kitchen table to talk I want to be there. I want to be the one instilling values in their lives, and I want to be the one hearing about their friend's problems. In a few short years they'll be out of the house and any influence I've had in their lives is nearly done. 90% of it has been deposited, hopefully, into their hearts and minds. And then, if I want to go back to the rat race on a full time basis I can (but seriously - I doubt I'll want to). ;o) Then it'll be time to get buy a trailer and a truck and hit the road. ;o)
Good luck making this decision mama. Go with your heart.