I agree with A&K, in most situations it's best for there to be one custodial parent and one place the children truly consider home and that should be with whomever was the primary caregiver over the years.
My case is somewhat unique in that my ex and I were equals as far as care giving and time spent with our D11. If that wasn't the case, the mediator would not have come to the conclusion he did. One of the conditions of our agreement was that our D11 would go to school where ever my ex lived, however we both had to live in in a certain predefined area. This ensured that that my D11 would go to good schools and that my ex couldn't move 50 miles away with her.
RSF, you've got to take an honest look at your sitch. Was your W the primary caregiver? Did she spend more time with the kids? If so, the courts will most likely favor her and rightfully so.
Your desire for 50/50 custody is honorable, but is it best for the kids? Will it upset their lives and routine too much? Only you can answer that.
I consider myself truly blessed that I have my D11 in my life as much as I do.
Me45 (D11 from 1st marriage) W43 (D20 & D16 from 1st marriage) M4 Bomb 6/16/09 W wants D W moved out 8/29/09 I sent her D paperwork 9/25/09...I'm done