Limit tournament hand...turn decision with a short stack

[LaggyLou]

I accidentally signed up for a limit tournament. Top 50 pay, we're still pretty far from the money (75 or so left). Par stack is about 5K.

Party Poker Limit Hold'em Tourney, Big Blind t300 (9 handed) converter

saw flop

Button (t3680)
SB (t3710)
Hero (t2720)
UTG (t4465)
UTG+1 (t2858)
MP1 (t3185)
MP2 (t5120)
MP3 (t9830)
CO (t5460)

Preflop: Hero is BB with A[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/club.gif[/img].
<font color="#666666">4 folds</font>, MP3 calls, <font color="#666666">2 folds</font>, SB completes, Hero checks.

Flop: (3 SB, t900) 5[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, MP3 calls, SB calls.

Turn: (3 BB, t1800) 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, Hero checks, <font color="#CC3333">MP3 bets</font>, SB calls, Hero ....... ?