So glad I am not the only person trying to decide this already. I use the excuse of "I want to make sure everyone gets to do what they really want to do". We will have FP for each park. I'm going to be 5 months pregnant with a toddler in tow so my choices are pretty limited. I am thinking I will pick:
MK: Peter Pan (2x), Winnie the Pooh
HS: TSM at least once, if DD really likes it, I'll do more, if not I will give my FP for ToT to the other kids
Epcot: I might try Soarin, or else give all my FPs to the other kids
AK: Safari once, other FP to the other kids
And I know you didn't ask but my Daisy group:
MK: Buzz, Jungle Cruise, Philharmagic
HS: Little Mermaid, give FPs to the other kids
Epcot: Living with the Land, Maelstrom (2x)
AK: giving away all FPs
As I said, between the rides I can't do while pregnant and the ones DD won't sit through, my choices are almost made for me

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