QQ with 3 spades on flop

[kris_p]

PokerStars No-Limit Hold'em Tourney, Big Blind is t100 (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

SB (t15825)
BB (t5567)
UTG (t5940)
UTG+1 (t3230)
MP1 (t5235)
Hero (t12115)
MP3 (t15353)
CO (t3720)
Button (t6195)

Preflop: Hero is MP2 with Q[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">UTG+1 raises to t300</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to t900</font>, <font color="#666666">5 folds</font>, UTG+1 calls t600.

Flop: (t1950) 9[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
UTG+1 checks, hero??

What do people think is best here?

No stats on utg+1 but it may be worth noting that he folded to a preflop reraise about two hands earlier, and he took quite a long time before he checked on the flop.

Any suggestions are welcome, should I have reraised more preflop perhaps?