stars sunday million 400/800 level

[Mr. Sobchack]

i've been at this table for about 30 minutes and it hasn't been too crazy or anything. i don't have much of a read on either player, not sure i've seen either one of them play a hand passed the flop. the preflop raiser has not raised very many hands before the flop so far.

my question here is on the turn. i would like to know what most people in my position would/should be thinking and what action to usually make.

response to any part of the hand is welcome. thanks

PokerStars No-Limit Hold'em Tourney, Big Blind is t800 (9 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP3 (t15770)
CO (t18325)
Button (t8925)
Hero (t22450)
BB (t23900)
UTG (t39825)
UTG+1 (t30390)
MP1 (t9700)
MP2 (t16200)

Preflop: Hero is SB with J, A.
4 folds</font>, MP3 raises to t1600</font>, 2 folds</font>, Hero calls t1200, BB calls t800.

Flop: (t4800) 9, Q, J (3 players)</font>
Hero checks, BB bets t2400</font>, MP3 calls t2400, Hero calls t2400.

Turn: (t12000) 7 (3 players)</font>
Hero checks, BB bets t3200</font>, MP3 calls t3200, hero??

i have about 18k left and there is about 18k in the pot