QQ full ring - problem on the turn

[Deamon2]

villain seems like a reasonable platyer. he bought in for what seems like his whole bankroll (something like $170).

Party Poker 0.5/1 Hold'em (10 handed) converter

Preflop: Hero is CO with Q[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, UTG+2 calls, <font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises</font>, Button calls, <font color="#666666">1 fold</font>, BB calls, UTG+2 calls.

Flop: (8.50 SB) 9[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, UTG+2 checks, <font color="#CC3333">Hero bets</font>, Button calls, BB calls, UTG+2 calls.

Turn: (6.25 BB) 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">BB bets</font>, UTG+2 calls, Hero ???

given that villain seems to be a thinking opponent (whethere he is skilled or not is a differnt story entirely), what's you're line here?