Those weren't short spears.
Hmmm, does "Shield and Pike Style" (use a light shield at the same time as a two-handed piercing reach weapon) from Dragon also let you use longspears one-handed, or do you still need to take "Monkey Grip" for that? I don't have them in front of me, but IIRC those are the feats you'd need for a Spartan like in the movie.
Sidetrack:
I disagree on your stats for Spartans, though (at least for the movie). They wouldn't be anywhere near level 20, especially since most of their opponents were, say, level 3 Warriors (even the Immortals were only like sixth-level Fighters). They wouldn't be on 25-point point buy, since even an NPC hireling gets 28, and the stats you did give them are absurd (weak-willed borderline-autistic dumbasses?!?)
My opinion:
Level 10 Fighter
Str 15
Dex 16
Con 14
Int 10
Wis 10
Cha 12