NL200 flop set oop after 3-bet preflop

[Paul Levy]

Villain is unknown, I think I have a tightish image, but Renton can confirm having been at the table for a while.

PokerStars No-Limit Hold'em, $2 BB (9 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

CO ($177)
Button ($162.45)
SB ($200)
BB ($87)
Hero ($407.25)
UTG+1 ($204)
MP1 ($200)
MP2 ($96)
MP3 ($220.45)

Preflop: Hero is UTG with 7[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/diamond.gif[/img]. CO posts a blind of $2.
<font color="#CC3333">Hero raises to $6</font>, <font color="#666666">4 folds</font>, <font color="#CC3333">CO raises to $18</font>, <font color="#666666">3 folds</font>, Hero calls $12.

Flop: ($39) 7[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">CO bets $2</font>, <font color="#CC3333">Hero raises to $30</font>, <font color="#CC3333">CO raises to $159</font>

Hero?