AA on the button

[aexchange]

Party Poker $1/$2 NL (6 Max)

Hero: ~ $470
Villan: ~ $600

We have both built our stacks up against the weaker players on the table.. Villan has made quite a bit of money against donkey's and seems to be a reasonable player. The table has been full of donkey's lately and we've both been running over them building up our respective stacks.

Hero is dealt AA on the button.
Villan is in the SB.

Two limpers. Hero raises to $8. Villan reraises to $24. I've seen him do this with a narrow range of hands (AA/KK/QQ/AK/maybe JJ). Limpers fold. Hero calls.

Flop: K 7 4 rainbow.

Villan leads out for $40. Hero raises to $140. Villan goes all-in. Hero?