I'm a planner too and it has served me very well thus far. Planning has been a big, huge, gigantic key to my weight loss success thus far.
The breakdown, of course depends on your calorie level.
My breakdown looks something like this:
Breakfast - about 200 calories
Snack - about 100
Lunch - about 300 - 400
Snack - about 100
Dinner - about 400 - 500
Snack - about 100
Sometimes, my snacks are a little smaller and more frequent. Like I'll fit in 2 snacks at 50 calories each, as opposed to the one snack at 100 calories. It depends on my schedule for the day, as my work times vary. Sometimes they'll be higher and again, more frequent if my lunches and dinners are on the lower end.
I make sure those calories are good, satiating ones, by the way. I need to get the most out of them.