Hammers and axes tend to be very similar (warhammer <=> battleaxe), so modeling it on the halberd seems like a good idea.
They're similar till they become 2 handed, and then they turn into the
Greataxe (1d12, high crit) > Halberd (1d10, reach)
and the
Maul (2d6) > Pole Hammer (?)
[EDIT] Hey look at that, my thinking was that reach must be roughly equal to two die sizes and since dice bottomed out at d4 2d6s would stop there. I wasn't thinking that 2d6 > 1d12 > 1d10. 1d10 IT IS!
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