Appreciate all the replies, and putting the money aside, which is something I will work through and have actually gotten more comfortable with in terms of the disparities and the amount ex spends on the kids, buying them stuff, etc.
I agree completely with making memories and connecting by spending time, doing little things, silly things. (Each night I create a new star wars character by finding things in my closet to dress up and an epic light saber battle ensues). I don't have the disposable income to spend the way she does and will be able to, but more importantly, I don't want my kids to be spoiled brats. So they have chores, and when my 8 or 5 year old boys pee everywhere (seriously how do they pee in the places that they pee instead of that huge round opening in the toilet), they have to clean it up.
I guess I was curious though to find out if anyone else had any remaining feelings of guilt or sadness for the kids in terms of ending the lifestyle they knew for a different one. Again, I do not miss the ex one bit. I made the right choice without question. But even so, there are things about the old life that I had that are missed and different for the kids and myself. All in all, I'm actually pretty darn happy.
Thanks all again.