$4 180 on the bubble vs big stack

[GoRedBirds]

Just moved to this table, not really any reads. Did I really screw this up? River play? Just fold preflop? Any comments appreciated.

PokerStars No-Limit Hold'em Tourney, Big Blind is t400 (7 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

CO (t15700)
Button (t4678)
SB (t33092)
Hero (t15606)
UTG (t9395)
MP1 (t21290)
MP2 (t13530)

Preflop: Hero is BB with K[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/spade.gif[/img].
<font color="#666666">5 folds</font>, <font color="#CC3333">SB raises to t800</font>, Hero calls t400.

Flop: (t1350) 5[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets t600</font>, <font color="#CC3333">Hero raises to t1600</font>, SB calls t1000.

Turn: (t4550) J[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets t2000</font>, Hero calls t2000.

River: (t8550) 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks