LSG, there were times I was sure that I wanted out of my marriage faster than my W, and then reality hits. Once kids are around, there is no clean exit. It forced me to make sure anger wasn't the emotion running me.
I'm not saying that anger is your key emotion now, just take a look in the rear view and make sure. She deserves punishment, but in the end, you both need to have happiness to pass on to your kids, regardless of the marriage.