400NL Argh - AA on the button and some idiot just shoved on the turn!

[BigDan9]

Villain is 18/8/1.6 over 100 hands or so and more or less unknown.

Ongame Poker No Limit Hold'Em, $2/$4 (8 handed).

SB ($394)
BB ($339)
UTG ($405)
Villain/UTG+1 ($394)
MP1 ($340)
MP2 ($377)
CO ($188)
Hero/BTN ($465)


Preflop: Hero is BTN with A[img]/images/graemlins/spade.gif[/img]A[img]/images/graemlins/heart.gif[/img]. UTG folds, Villain raises to $18, 3 folds, Hero raises to $40, 2 folds, Villain calls.

Flop: ($86) 3[img]/images/graemlins/club.gif[/img]5[img]/images/graemlins/spade.gif[/img]2[img]/images/graemlins/club.gif[/img] (2 players)
Villain checks, Hero bets $70, Villain calls.

Turn: ($226) T[img]/images/graemlins/club.gif[/img] (2 players)
Villain bets $284 and is all-in. Hero?

WTF? Up until this push on the turn, I figured Villain for a pair in the 99-KK range. I thought AK was less likely for obvious reasons, although clearly not impossible.

Anyway, I’m left with two moves on the turn, but which one’s better? Does the fact I don’t have the Ac make a difference?