Pot control w/ AA $.50/$1

[ChipsAhoya]

I play NL in tournaments and live, but am not as used to playing with the deeper stacks in cash games, so I'm trying to avoid getting stacked since I'm also predominately a limit player used to calling down with top pair.

I check behind on the flop for pot control ala PNLHE. I sat down at the table a few hands ago, so I have no read on villain except that he has 4 stacks on the table. I figure the flat call on the turn is fine, what do I do facing a PSB on the river that gives the AK I "likely have" the straight?

Full Tilt Poker - No Limit Hold'em Cash Game - $0.50/$1 Blinds - 5 Players - (LegoPoker Hand History Converter)

SB: $160.60
Hero (BB): $146.00
UTG: $122.60
CO: $98.50
BTN: $404.00

Preflop: Hero is dealt A[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/heart.gif[/img] (5 Players)
<font color="red">Hero raises to $4.00</font>, 2 folds, BTN calls $3.50, SB folds

Flop: ($9) 5[img]/images/graemlins/club.gif[/img] T[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/spade.gif[/img] (2 Players)
BTN checks, Hero checks

Turn: ($9) 3[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">BTN bets $9.00</font>, Hero calls $9.00

River: ($27) Q[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">BTN bets $27.00</font> Hero...???
Pot Size: $27.00

Thanks,
-ChipsAhoya