I am glad you can get along with your ex. Ultimately I do think it is nice for the kids that you can get along. And it decreases your stress level, too, right?
I have already been thinking about the college thing even though my oldest only just turned 8! I will save up some money for them, but I want them to keep up their grades and work to earn scholarships, too. And I figure my 'financial aid' will be conditional on them maintaining good grades once they are in college...