FNM I commend you for fighting for your kids, if mine comes to D im going to do exactly the same thing and think that more men should.
Im with you on the poor parent thing...my wife is a good mother, but im a good dad too so I have no idea how someone is going to decide one of us deserves custody more than the other. The only slight advantage I may have is my family is nearby and my son has always stayed with my mother when he was sick, she was the one that took him to dr's appts, its where he goes before and after school etc., and im told that one of the things judges look at is who does these type of things to see who is the more involved parent. B/c we both worked my mother took care of all of that and will be available to do all of that still if I get custody, obviously she'd do it for my W too even if we D, but couldnt if my wife moved and I think thats whats being planned.
Good luck I hope and pray your R works out, but if not then I certainly hope you get at least 50/50 with your kids.