25 Max - QQ vs. a nit, 150 bb deep, bad turn

[UFGatorGuy]

Villain in this hand is 13.2/10.7/5.7 over 170 hands. I haven't seen him get out of control or do anything crazy postflop yet. Are we deep enough to warrant cautious play here? ~150 BB effective stacks, what's your line on this turn?

PokerStars No-Limit Hold'em, $0.25 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

BB ($23.25)
UTG ($36.85)
Hero ($57.95)
CO ($12.30)
Button ($9.15)
SB ($26.50)

Preflop: Hero is MP with Q[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">UTG raises to $1</font>, <font color="#CC3333">Hero raises to $3.5</font>, <font color="#666666">4 folds</font>, UTG calls $2.50.

Flop: ($7.35) 5[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, <font color="#CC3333">Hero bets $5</font>, UTG calls $5.

Turn: ($17.35) A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, <font color="#CC3333">Hero ???