I really want my nighttime stuff (i.e. Spectromagic, firerworks, Fantasmic, Illuminations) to come out this time, but I'm not sure what film to go with.
I would go with 800 or the highest ASA possible. I would also suggest getting your night-time photographs developed at WDW. We used the shop at Epcot. For some reason, they seem to come out better there than anywhere else that has developed them.
Hopefully, you'll get to see your nighttime shows twice...once behind a camera and another time just to enjoy!