KK, turn pairs board

[PeeTang]

No strong reads, but BB and UTG +1 both seem to be playing too many hands, and have been calling/betting most of them, but that's over a pretty small sample.

PokerStars No-Limit Hold'em Tourney, Big Blind is t50 (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

CO (t2025)
Hero (t1760)
SB (t1210)
BB (t3985)
UTG (t790)
UTG+1 (t4295)
MP1 (t2595)
MP2 (t5095)
MP3 (t2225)

Preflop: Hero is Button with K[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 fold</font>, UTG+1 calls t50, <font color="#666666">4 folds</font>, <font color="#CC3333">Hero raises to t250</font>, <font color="#666666">1 fold</font>, BB calls t200, UTG+1 calls t200.

Flop: (t775) 9[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">BB bets t200</font>, UTG+1 folds, <font color="#CC3333">Hero raises to t600</font>, BB calls t400.

Turn: (t1975) Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets t3135 (All-In)</font>, Hero?

After my flop re-raise, I was left with 900. Should I have pushed then?

Not sure what to do here. I think hands like Qx, Q7, Q9, 77, and 99 are all possible with this opponent. Should I call BS with only 900 left?